Restore dots menu on mobile

react/features/toolbox/components/web/Toolbox.js

     participantUpdated
 } from '../../../base/participants';
 import { connect, equals } from '../../../base/redux';
+import { isMobileBrowser } from '../../../base/environment/utils';
 import { OverflowMenuItem } from '../../../base/toolbox/components';
 import { getLocalVideoTrack, toggleScreensharing } from '../../../base/tracks';
 import { VideoBlurButton } from '../../../blur';
             / 2 // divide by the number of groups(left and right group)
         );
 
+        const showOverflowMenu = this.state.windowWidth >= verySmallThreshold || isMobileBrowser();
+
         if (this._shouldShowButton('chat')) {
             buttonsLeft.push('chat');
         }
         if (this._shouldShowButton('closedcaptions')) {
             buttonsLeft.push('closedcaptions');
         }
-        if (overflowHasItems && this.state.windowWidth >= verySmallThreshold) {
+        if (overflowHasItems && showOverflowMenu) {
             buttonsRight.push('overflowmenu');
         }
         if (this._shouldShowButton('invite')) {
             movedButtons.push(...buttonsLeft.splice(
                 maxNumberOfButtonsPerGroup,
                 buttonsLeft.length - maxNumberOfButtonsPerGroup));
-            if (buttonsRight.indexOf('overflowmenu') === -1 && this.state.windowWidth >= verySmallThreshold) {
+            if (buttonsRight.indexOf('overflowmenu') === -1 && showOverflowMenu) {
                 buttonsRight.unshift('overflowmenu');
             }
         }
 
         if (buttonsRight.length > maxNumberOfButtonsPerGroup) {
-            if (buttonsRight.indexOf('overflowmenu') === -1 && this.state.windowWidth >= verySmallThreshold) {
+            if (buttonsRight.indexOf('overflowmenu') === -1 && showOverflowMenu) {
                 buttonsRight.unshift('overflowmenu');
             }
 
                             tooltip = { t('toolbar.invite') } /> }
                     { buttonsRight.indexOf('security') !== -1
                         && <SecurityDialogButton customClass = 'security-toolbar-button' /> }
-                    { buttonsRight.indexOf('overflowmenu') !== -1 && this.state.windowWidth >= verySmallThreshold
+                    { buttonsRight.indexOf('overflowmenu') !== -1
                         && <OverflowMenuButton
                             isOpen = { _overflowMenuVisible }
                             onVisibilityChange = { this._onSetOverflowVisible }>