@colin has suggested a fix that worked for me, using latest SU 2021.1.331 on Mac but running on an older OS - Mojave.
See post no 10 by Colin in this thread Tags palette and screen space - #10 by Odd_Haakon_Byberg
Can anyone with the right permissions consolidate what are now many threads on the same subject, some of which contain one or more solutions ranging from an OS update to ‘wait for the next release’, but Colin’s fix seems to work more simply, though I haven’t explored any side effects yet such as loss of personal customisations.