diff --git a/webapp/src/components/custom_post_types/post_type/component.tsx b/webapp/src/components/custom_post_types/post_type/component.tsx
index 902c73e04..2cb59a431 100644
--- a/webapp/src/components/custom_post_types/post_type/component.tsx
+++ b/webapp/src/components/custom_post_types/post_type/component.tsx
@@ -22,8 +22,6 @@ import {
     callStartedTimestampFn,
     getCallPropsFromPost,
     getUserDisplayName,
-    sendDesktopEvent,
-    shouldRenderDesktopWidget,
     toHuman,
     untranslatable,
 } from 'src/utils';
@@ -74,9 +72,8 @@ const PostType = ({
             // NOTE: this also handles the desktop global widget case since the opener window
             // will have the client.
             callsClient.disconnect();
-        } else if (shouldRenderDesktopWidget()) {
-            // DEPRECATED: legacy Desktop API logic (<= 5.6.0)
-            sendDesktopEvent('calls-leave-call', {callID: post.channel_id});
+        } else if (window.desktopAPI?.leaveCall) {
+            window.desktopAPI.leaveCall();
         }
     };
 
diff --git a/webapp/src/components/expanded_view/component.tsx b/webapp/src/components/expanded_view/component.tsx
index 06c112f88..675a4e5a1 100644
--- a/webapp/src/components/expanded_view/component.tsx
+++ b/webapp/src/components/expanded_view/component.tsx
@@ -16,7 +16,6 @@ import React from 'react';
 import {OverlayTrigger, Tooltip} from 'react-bootstrap';
 import {IntlShape} from 'react-intl';
 import {RouteComponentProps} from 'react-router-dom';
-import {compareSemVer} from 'semver-parser';
 import {hostMuteOthers, hostRemove} from 'src/actions';
 import {Badge} from 'src/components/badge';
 import CallDuration from 'src/components/call_widget/call_duration';
@@ -73,7 +72,6 @@ import {
     isDMChannel,
     sendDesktopEvent,
     setCallsGlobalCSSVars,
-    shouldRenderDesktopWidget,
     untranslatable,
 } from 'src/utils';
 import styled, {createGlobalStyle, css} from 'styled-components';
@@ -493,14 +491,9 @@ export default class ExpandedView extends React.PureComponent<Props, State> {
             });
             this.props.trackEvent(Telemetry.Event.UnshareScreen, Telemetry.Source.ExpandedView, {initiator: fromShortcut ? 'shortcut' : 'button'});
         } else if (!this.props.screenSharingSession) {
-            if (window.desktop && compareSemVer(window.desktop.version, '5.1.0') >= 0) {
-                this.props.showScreenSourceModal();
-            } else if (window.desktopAPI?.openScreenShareModal) {
+            if (window.desktopAPI?.openScreenShareModal) {
                 logDebug('desktopAPI.openScreenShareModal');
                 window.desktopAPI.openScreenShareModal();
-            } else if (shouldRenderDesktopWidget()) {
-                // DEPRECATED: legacy Desktop API logic (<= 5.6.0)
-                sendDesktopEvent('desktop-sources-modal-request');
             } else {
                 const stream = await getScreenStream('', hasExperimentalFlag());
                 if (window.opener && stream) {