Disabling the all mention

web/react/utils/constants.jsx

@@ -68,7 +68,8 @@ export default {
         TYPING: 'typing'
     },
 
-    SPECIAL_MENTIONS: ['all', 'channel'],
+    //SPECIAL_MENTIONS: ['all', 'channel'],
+    SPECIAL_MENTIONS: ['channel'],
     CHARACTER_LIMIT: 4000,
     IMAGE_TYPES: ['jpg', 'gif', 'bmp', 'png', 'jpeg'],
     AUDIO_TYPES: ['mp3', 'wav', 'wma', 'm4a', 'flac', 'aac'],