Use Element Call exclusively

config.json

@@ -45,6 +45,9 @@
     "UIFeature.passwordReset": false,
     "UIFeature.deactivate": false
   },
+  "element_call": {
+    "use_exclusively": true
+  },
   "features": {
     "feature_report_to_moderators": true,
     "feature_jump_to_date": true,