Click the trashcan icon in the toolbox (do this as many times to delete the table as needed)
WITHOUT clicking ANYWHER else on the screen (the trash can should have been the last thing you clicked on) if you click the APPLY (save) button, you will enter a mode that is in an error state that you can't get out of unless you refresh the screen.
@christopherdengler I'm unable to reproduce this error currently, is it possible you could send me details of the browser you are using as well as any error information you're seeing in the console.
Steps to repro: