OMG this has been one of the worst aspects of Evernote for me. Finally got fed up today. Took forever to find a solution. The above didn't work because for whatever reason, my Win11 Pro version doesn't (easily?) allow me to drag icons onto the deskop... doesn't allow cascading of windows... just a mess. But I did have Evernote in my taskbar and this is what worked:
Hover over the taskbar icon
Select the missing window with mouse
Press the Windows key and hold
Click different arrow keys to see which one snaps the window back. The left and right keys have worked for me, but I suspect it depends on where your missing window is in virtual space
This Microsoft thread helped: https://learn.microsoft.com/en-us/answers/questions/693740/how-do-i-get-access-to-my-window-need-cascade-wind