Need to find files having errant tag

Due to a mistake in one of my "Actions", I now have files that have an "_ALL" tag. How can I filter these files so that I can delete the tag?

I tried creating a column with the value %_ALL%, but that does not seem to work. Thanks.

Filter for…

%_ALL% PRESENT

….will show this. Select All, then check extended tags, confirm and delete.

Thanks, removing the % works, i.e. _ALL PRESENT