Ctrl+Alt+W is actually used by WatchMenu.2, WatchMenu.3 and WatchMenu.4 as shown -
Please remove these shortcuts by clicking on Remove button and then you can assign it to any other shortcut you want as shown -
Hope this helps,
Thanks and Regards,
Rakshith M B
I've removed from all 'WatchMenu' and now it's working as I like.
Glad your issue is resolved