Hide multi device UI if flag is not set

_locales/en/messages.json

@@ -1302,10 +1302,6 @@
     "message": "Typing Indicators",
     "description": "Title of the typing indicators setting"
   },
-  "multiDeviceDisabledTemporary": {
-    "message": "MultiDevice disabled temporarily",
-    "description": "Description of why multi device is disabled"
-  },
   "messageTTL": {
     "message": "Message TTL",
     "description": "Title of the Message TTL setting"

ts/components/session/LeftPaneSettingSection.tsx

@@ -225,7 +225,7 @@ export class LeftPaneSettingSection extends React.Component<Props, State> {
       {
         id: SessionSettingCategory.Devices,
         title: window.i18n('devicesSettingsTitle'),
-        hidden: isSecondaryDevice,
+        hidden: !window.lokiFeatureFlags.useMultiDevice || isSecondaryDevice,
       },
     ];
   }

ts/components/session/RegistrationTabs.tsx

@@ -557,9 +557,12 @@ export class RegistrationTabs extends React.Component<{}, State> {
             SessionButtonType.BrandOutline,
             SessionButtonColor.Green
           )}
-          {/*<h4>{or}</h4>*/}
-          {/* FIXME enable back to allow linking of device
-              this.renderLinkDeviceToExistingAccountButton() */}
+          {window.lokiFeatureFlags.useMultiDevice && (
+            <>
+              <h4>{or}</h4>
+              {this.renderLinkDeviceToExistingAccountButton()}
+            </>
+          )}
         </div>
       );
     }
@@ -584,9 +587,12 @@ export class RegistrationTabs extends React.Component<{}, State> {
     return (
       <div>
         {this.renderContinueYourSessionButton()}
-        {/*<h4>{or}</h4>*/}
-        {/* FIXME enable back to allow linking of device
-            this.renderLinkDeviceToExistingAccountButton()*/}
+        {window.lokiFeatureFlags.useMultiDevice && (
+          <>
+            <h4>{or}</h4>
+            {this.renderLinkDeviceToExistingAccountButton()}
+          </>
+        )}
       </div>
     );
   }

ts/components/session/settings/SessionSettings.tsx

@@ -644,7 +644,7 @@ export class SettingsView extends React.Component<SettingsViewProps, State> {
           id: 'no-linked-device',
           title: noPairedDeviceText,
           type: undefined,
-          description: window.i18n('multiDeviceDisabledTemporary'),
+          description: '',
           category: SessionSettingCategory.Devices,
           content: {},
           comparisonValue: undefined,

ts/components/session/settings/SessionSettingsHeader.tsx

@@ -74,12 +74,9 @@ export class SettingsHeader extends React.Component<Props, any> {
         ? `${categoryTitlePrefix.slice(0, -1)} Settings`
         : `${categoryTitlePrefix} Settings`;
     const showSearch = false;
-    const showAddDevice = false;
-    /* FIXME enable back to allow linking of device
-      const showAddDevice =
+    const showAddDevice =
       category === SessionSettingCategory.Devices &&
       this.props.showLinkDeviceButton;
-      */
 
     return (
       <div className="session-settings-header">