Sounds like excel is still doing what it has done for a while. Even though windows can finally (again) treat excel instances separately in the task bar, clicking one brings up the single excel window containing all excel files open. So if I open a 2nd excel file, then x it out, the 1st file is on top now. This doesn’t bug me when it’s the browser or Adobe because those at least clearly present as tabbed items and, more importantly, can be broken out to different windows