Add sender key feature flag

preload.js

@@ -431,6 +431,7 @@ window.lokiFeatureFlags = {
   useSnodeProxy: !process.env.USE_STUBBED_NETWORK,
   useOnionRequests: true,
   useFileOnionRequests: false,
+  enableSenderKeys: false,
   onionRequestHops: 1,
 };
 

ts/components/session/SessionClosableOverlay.tsx

@@ -249,26 +249,27 @@ export class SessionClosableOverlay extends React.Component<Props, State> {
           />
         )}
 
-        {isClosedGroupView && (
-          <div className="sealed-sender-toggle">
-            <SessionToggle
-              active={Boolean(false)}
-              onClick={() => {
-                const value = this.state.senderKeys;
-                this.setState({ senderKeys: !value });
-              }}
-            />
-
-            <span
-              className={classNames(
-                'session-settings-item__description',
-                'sender-keys-description'
-              )}
-            >
-              {window.i18n('useSenderKeys')}
-            </span>
-          </div>
-        )}
+        {isClosedGroupView &&
+          window.lokiFeatureFlags.enableSenderKeys && (
+            <div className="sealed-sender-toggle">
+              <SessionToggle
+                active={Boolean(false)}
+                onClick={() => {
+                  const value = this.state.senderKeys;
+                  this.setState({ senderKeys: !value });
+                }}
+              />
+
+              <span
+                className={classNames(
+                  'session-settings-item__description',
+                  'sender-keys-description'
+                )}
+              >
+                {window.i18n('useSenderKeys')}
+              </span>
+            </div>
+          )}
 
         <SessionButton
           buttonColor={SessionButtonColor.Green}