I just updated Parallels Toolbox and was excited to try the new Focus on Window tool (macOS 11.5). There seems to be a major bug in that it's apparently impossible to turn it off. Clicking it again does nothing, and trying to open its preferences window also doesn't work, as no window opens anywhere. Even quitting Toolbox and restarting it doesn't disable the window focus. Finally, restarting macOS doesn't even work because as soon as Toolbox is launched again, Focus on Window is reactivated.
It may be worth noting that I'd probably qualify as an expert user, as I use the Mac for software development and am comfortable with the Terminal, Activity Monitor, and UI. I've looked in every hidden corner for the preferences window for the Focus on Window utility, but it's nowhere to be found. This does appear to be a significant bug, at least on macOS 11.5.
It may be worth noting that I'd probably qualify as an expert user, as I use the Mac for software development and am comfortable with the Terminal, Activity Monitor, and UI. I've looked in every hidden corner for the preferences window for the Focus on Window utility, but it's nowhere to be found. This does appear to be a significant bug, at least on macOS 11.5.