diff --git a/src/client/web/src/components/core_state.ts b/src/client/web/src/components/core_state.ts
index 5bc2b01..acf0638 100644
--- a/src/client/web/src/components/core_state.ts
+++ b/src/client/web/src/components/core_state.ts
@@ -19,7 +19,6 @@ export interface MsgProps {
 }
 
 export interface UIProps {
-  // background: url("/static/img/textured_paper.png") repeat fixed center;
   wallpaper: string;
   repeat: string;
   position: string;
@@ -63,7 +62,7 @@ export function initState(): ICoreState {
     },
     panes: {
       displaying: "browser",
-      paneNames: Set<string>(["settings", "login", "admin"]),
+      paneNames: Set<string>([]), // "settings", "login", "admin"
     },
     login: {
       userID: "",
diff --git a/src/client/web/src/components/pane_login.tsx b/src/client/web/src/components/pane_login.tsx
index 3864b38..03faac3 100644
--- a/src/client/web/src/components/pane_login.tsx
+++ b/src/client/web/src/components/pane_login.tsx
@@ -97,21 +97,6 @@ export class AuthPane extends React.Component<Props, State, {}> {
       });
   };
 
-  logout = async () => {
-    return updater()
-      .logout()
-      .then((ok: boolean) => {
-        if (ok) {
-          this.update(updater().updateLogin);
-        } else {
-          alertMsg(this.props.msg.pkg.get("login.logout.fail"));
-        }
-      })
-      .then(() => {
-        return this.refreshCaptcha();
-      });
-  };
-
   refreshCaptcha = async () => {
     return updater()
       .getCaptchaID()
@@ -177,12 +162,6 @@ export class AuthPane extends React.Component<Props, State, {}> {
             </div>
           </div>
         </div>
-
-        <span style={{ display: this.props.login.authed ? "inherit" : "none" }}>
-          <button onClick={this.logout}>
-            {this.props.msg.pkg.get("login.logout")}
-          </button>
-        </span>
       </span>
     );
   }
diff --git a/src/client/web/src/components/panes.tsx b/src/client/web/src/components/panes.tsx
index 5e5abee..2f90251 100644
--- a/src/client/web/src/components/panes.tsx
+++ b/src/client/web/src/components/panes.tsx
@@ -20,7 +20,7 @@ export interface Props {
   update?: (updater: (prevState: ICoreState) => ICoreState) => void;
 }
 
-export interface State {}
+export interface State { }
 export class Panes extends React.Component<Props, State, {}> {
   constructor(p: Props) {
     super(p);
@@ -35,55 +35,11 @@ export class Panes extends React.Component<Props, State, {}> {
 
   render() {
     let displaying = this.props.panes.displaying;
-
-    let panesMap: Map<string, JSX.Element> = Map({});
-    const settingsPane = (
-      <PaneSettings
-        login={this.props.login}
-        msg={this.props.msg}
-        update={this.props.update}
-      />
-    );
-    const loginPane = (
-      <AuthPane
-        login={this.props.login}
-        update={this.props.update}
-        msg={this.props.msg}
-      />
-    );
-    const adminPane = (
-      <AdminPane
-        admin={this.props.admin}
-        msg={this.props.msg}
-        update={this.props.update}
-      />
-    );
-
-    switch(this.props.login.userRole) {
-    case roleAdmin:
-      panesMap = panesMap.set("settings", settingsPane);
-      panesMap = panesMap.set("admin", adminPane);
-      panesMap = panesMap.set("login", loginPane);
-      break;
-    case roleUser:
-      panesMap = panesMap.set("settings", settingsPane);
-      panesMap = panesMap.set("login", loginPane);
-      break;
-    default:
-      panesMap = panesMap.set("login", loginPane);
-      break;
-    }
-
-    const panes = panesMap.keySeq().map((paneName: string): JSX.Element => {
-      const isDisplay = displaying === paneName ? "" : "hidden";
-      return (
-        <div key={paneName} className={`${isDisplay}`}>
-          {panesMap.get(paneName)}
-        </div>
-      );
-    });
-
     const btnClass = displaying === "login" ? "hidden" : "";
+    const showSettings = this.props.panes.paneNames.get("settings") && displaying === "settings" ? "" : "hidden";
+    const showLogin = this.props.panes.paneNames.get("login") && displaying === "login" ? "" : "hidden";
+    const showAdmin = this.props.panes.paneNames.get("admin") && displaying === "admin" ? "" : "hidden";
+
     return (
       <div id="panes" className={displaying === "" ? "hidden" : ""}>
         <div className="root-container">
@@ -102,7 +58,30 @@ export class Panes extends React.Component<Props, State, {}> {
             </div>
           </div>
 
-          {panes}
+          <div className={`${showSettings}`}>
+            <PaneSettings
+              login={this.props.login}
+              msg={this.props.msg}
+              update={this.props.update}
+            />
+          </div>
+
+          <div className={`${showLogin}`}>
+            <AuthPane
+              login={this.props.login}
+              update={this.props.update}
+              msg={this.props.msg}
+            />
+          </div>
+
+          <div className={`${showAdmin}`}>
+            <AdminPane
+              admin={this.props.admin}
+              msg={this.props.msg}
+              update={this.props.update}
+            />
+          </div>
+
         </div>
       </div>
     );
diff --git a/src/client/web/src/components/root_frame.tsx b/src/client/web/src/components/root_frame.tsx
index 50ca699..1442513 100644
--- a/src/client/web/src/components/root_frame.tsx
+++ b/src/client/web/src/components/root_frame.tsx
@@ -44,6 +44,7 @@ export class RootFrame extends React.Component<Props, State, {}> {
 
           <TopBar
             login={this.props.login}
+            panes={this.props.panes}
             msg={this.props.msg}
             update={this.props.update}
           />
diff --git a/src/client/web/src/components/state_mgr.tsx b/src/client/web/src/components/state_mgr.tsx
index f3d9f81..a0dbf9b 100644
--- a/src/client/web/src/components/state_mgr.tsx
+++ b/src/client/web/src/components/state_mgr.tsx
@@ -1,5 +1,5 @@
 import * as React from "react";
-import { List } from "immutable";
+import { List, Set } from "immutable";
 
 import { updater } from "./state_updater";
 import { ICoreState, newState } from "./core_state";
@@ -9,8 +9,8 @@ import { UsersClient } from "../client/users";
 import { IUsersClient, IFilesClient, roleAdmin, roleVisitor } from "../client";
 import { alertMsg } from "../common/env";
 
-export interface Props {}
-export interface State extends ICoreState {}
+export interface Props { }
+export interface State extends ICoreState { }
 
 export class StateMgr extends React.Component<Props, State, {}> {
   private usersClient: IUsersClient = new UsersClient("");
@@ -62,16 +62,24 @@ export class StateMgr extends React.Component<Props, State, {}> {
         if (updater().props.login.userRole === roleVisitor) {
           if (updater().props.browser.isSharing) {
             // sharing with visitor
+            updater().setPanes(Set<string>(["login"]));
             updater().displayPane("");
             return Promise.all([]);
           }
 
           // redirect to login
+          updater().setPanes(Set<string>(["login"]));
           updater().displayPane("login");
           return Promise.all([updater().getCaptchaID()]);
         }
 
+        if (updater().props.login.userRole === roleAdmin) {
+          updater().setPanes(Set<string>(["login", "settings", "admin"]));
+        } else {
+          updater().setPanes(Set<string>(["login", "settings"]));
+        }
         updater().displayPane("");
+
         return Promise.all([
           updater().refreshUploadings(),
           updater().initUploads(),
diff --git a/src/client/web/src/components/state_updater.ts b/src/client/web/src/components/state_updater.ts
index 40c6219..057b0c3 100644
--- a/src/client/web/src/components/state_updater.ts
+++ b/src/client/web/src/components/state_updater.ts
@@ -12,6 +12,7 @@ import {
   UploadInfo,
   Quota,
   Response,
+  roleVisitor,
 } from "../client";
 import { FilesClient } from "../client/files";
 import { UsersClient } from "../client/users";
@@ -279,11 +280,15 @@ export class Updater {
       if (pane != null) {
         this.props.panes.displaying = paneName;
       } else {
-        alertMsg(`dialgos: pane (${paneName}) not found`);
+        alertMsg(`pane (${paneName}) not found`);
       }
     }
   };
 
+  setPanes = (paneNames: Set<string>) => {
+    this.props.panes.paneNames = paneNames;
+  };
+
   self = async (): Promise<boolean> => {
     const resp = await this.usersClient.self();
     if (resp.status === 200) {
@@ -294,6 +299,7 @@ export class Updater {
       this.props.login.quota = resp.data.quota;
       return true;
     }
+    this.props.login.userRole = roleVisitor;
     return false;
   };
 
diff --git a/src/client/web/src/components/topbar.tsx b/src/client/web/src/components/topbar.tsx
index bcdb42c..d33ef93 100644
--- a/src/client/web/src/components/topbar.tsx
+++ b/src/client/web/src/components/topbar.tsx
@@ -1,15 +1,17 @@
 import * as React from "react";
 import { List } from "immutable";
-import { RiGithubFill } from "@react-icons/all-files/ri/RiGithubFill";
+import { alertMsg } from "../common/env";
 
 import { ICoreState, MsgProps } from "./core_state";
 import { LoginProps } from "./pane_login";
+import { PanesProps } from "./panes";
 import { updater } from "./state_updater";
 import { Flexbox } from "./layout/flexbox";
 
-export interface State {}
+export interface State { }
 export interface Props {
   login: LoginProps;
+  panes: PanesProps;
   msg: MsgProps;
   update?: (updater: (prevState: ICoreState) => ICoreState) => void;
 }
@@ -40,17 +42,34 @@ export class TopBar extends React.Component<Props, State, {}> {
       });
   };
 
+  logout = async () => {
+    return updater()
+      .logout()
+      .then((ok: boolean) => {
+        if (ok) {
+          this.props.update(updater().updateLogin);
+        } else {
+          alertMsg(this.props.msg.pkg.get("login.logout.fail"));
+        }
+      })
+      .then(() => {
+        return this.refreshCaptcha();
+      });
+  };
+
+  refreshCaptcha = async () => {
+    return updater()
+      .getCaptchaID()
+      .then(() => {
+        this.props.update(updater().updateLogin);
+      });
+  };
+
   render() {
-    const adminBtn =
-      this.props.login.userRole === "admin" ? (
-        <button
-          onClick={this.showAdmin}
-          className="grey3-bg grey4-font margin-r-m"
-          style={{ minWidth: "7rem" }}
-        >
-          {this.props.msg.pkg.get("admin")}
-        </button>
-      ) : null;
+    const showUserInfo = this.props.login.authed ? "" : "hidden";
+    const showLogin = this.props.login.authed ? "" : "hidden";
+    const showSettings = this.props.panes.paneNames.get("settings") ? "" : "hidden";
+    const showAdmin = this.props.panes.paneNames.get("admin") ? "" : "hidden";
 
     return (
       <div
@@ -69,7 +88,7 @@ export class TopBar extends React.Component<Props, State, {}> {
 
             <Flexbox
               children={List([
-                <span>
+                <span className={`${showUserInfo}`}>
                   <span className="grey3-font font-s">
                     {this.props.login.userName}
                   </span>
@@ -81,13 +100,23 @@ export class TopBar extends React.Component<Props, State, {}> {
 
                 <button
                   onClick={this.showSettings}
-                  className="grey3-bg grey4-font margin-r-m"
+                  className={`grey3-bg grey4-font margin-r-m ${showSettings}`}
                   style={{ minWidth: "7rem" }}
                 >
                   {this.props.msg.pkg.get("settings")}
                 </button>,
 
-                adminBtn,
+                <button
+                  onClick={this.showAdmin}
+                  className={`grey3-bg grey4-font margin-r-m ${showAdmin}`}
+                  style={{ minWidth: "7rem" }}
+                >
+                  {this.props.msg.pkg.get("admin")}
+                </button>,
+
+                <button onClick={this.logout} className={`${showLogin}`}>
+                  {this.props.msg.pkg.get("login.logout")}
+                </button>,
               ])}
               childrenStyles={List([{}, {}, {}, {}])}
             />,
diff --git a/src/handlers/multiusers/handlers.go b/src/handlers/multiusers/handlers.go
index 5eac582..22d90ee 100644
--- a/src/handlers/multiusers/handlers.go
+++ b/src/handlers/multiusers/handlers.go
@@ -111,6 +111,7 @@ func NewMultiUsersSvc(cfg gocfg.ICfg, deps *depidx.Deps) (*MultiUsersSvc, error)
 		apiRuleCname(userstore.VisitorRole, "OPTIONS", "/v1/settings/health"): true,
 		apiRuleCname(userstore.VisitorRole, "GET", "/v1/captchas/"):           true,
 		apiRuleCname(userstore.VisitorRole, "GET", "/v1/captchas/imgs"):       true,
+		apiRuleCname(userstore.VisitorRole, "GET", "/v1/fs/sharings/exist"):   true,
 	}
 
 	return &MultiUsersSvc{