Marching ants after select/copy/paste will not clear on Mac unless ESC is pressed. Why not on double click in a single cell?
This issue was fixed in 2018, so this status should have been updated much earlier than now, but the marching ants will go away if you take some other actions, including double-clicking to start editing a single cell, or typing in a cell.
This change was made directly in response to feedback that we received in this forum and by using the Send-a-Frown button in Excel. We encourage you to send feedback about any issues or suggestions, because we actively take feedback into account when making updates to Excel.
MICROSOFT SUCKS commented
WHAT AN ANNOYING FEATURE BUG. STOP WASTING EVERYONE'S TIME AND MAKE YOU BUG FEATURE AN OPTION. SOME ERR- PEOPLE- PROBABLY LIKE HITTING ESCAPE EACH TIME THEY COPY AND PASTE IN EXCEL.
I BET MORE PEOPLE DO NOT.
Not just on a Mac. I had this for the first time on PC today after an office update. I've found numerous complaints about it on community and this suggestions section and Microsoft seems to be ignoring us completely.