Hi, it's not a button, it's a drop area. I'll think how to improve UX here since it's not a first request.

Element deletion button is not working. Is there any file from which we can manipulate this.

Yes it would be excellent and also an option to hide the app icon 👍🏼

thanks for your comment and rating

Absolutely great. I could not live without this. Allows quick movement between virtual desktops... and much more @ eatsu: Since a picture tells more than thousand words - the pictures in the KDE...