After I upgraded to Big Sur, the status box above the tabs is a mess. It does not render properly. When I switch from tab to tab, there are remnants of the previous status. The execution times (if they show at all, don't reflect the execution time for the last query in the current tab. I use those times a LOT to compare execution times of various queries.
Attached are two screen shots. One after closing ALL query windows. Another with three query windows open.