@[jayk]
Had been puzzeld too by this message:
As far as I remember this was due to not having activated the option of watching (scanning?) for behavior (or similar)…
But I tested again and returned to WFC:
Downloaded the current version (had not even noticed before, that WFC now belongs to “Malwarebytes”…!)…
And I now noticed some improvements, which I seemingly missed because I dropped it more than 2 (or even more) years ago.