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Hover over the window in the task bar and right click on the preview. This should show the restore/minimize/maximize dialog. Click restore if it's an option then do the same and click move. You should be able to then use the arrow keys and "attach" the window to your mouse and move it to the visible area.
Edit: the other way to get this menu depends on the application but if you select the window and hit ALT and then space it should show the restore/minimize/maximize options.
I'm assuming you're on Windows?
Press Ctrl+Shift+Space and then M. That opens the window options -> move dialogue. You can then use the arrow keys on the keyboard to move the window into your visible space. Don't use the mouse before you can see the full window, or it resets to the original position!
It's an annoying bug many applications have, including Microsoft's own - the outlook meeting reminder popup gets lost fairly often.
I've found as long as you select the window, use the keyboard shortcut to select move as you noted, use the arrow keys to move it a few steps, after that move the mouse without clicking and the window often moves with it at that point.
But yeah it's the side effect of an inbuilt setting to remember last location on screen when the app was last used. Just not taking into account that the specific screen location is no longer available.
Yes you're right, that works once the window is at least partially visible on your active screen. There have been some occasions though where I tried to grab the screen and either misclicked, or whatever else happened that transported it back off-screen, so now I make it a point to navigate it fully onto my visible screen before touching it.
on windows, ive had something like this happen, but not using onlyoffice. what i did was change resolution to some other setting, then set back, and within the 2 changes the window would pop back to main screen
This happens constantly with different apps on windows when connecting and disconnecting monitors.
Altium and LTSpice are the worst about this. Pop-up dialog boxes that freeze the program showing up in an unattached monitor when the main window was already switched to the correct one.