On W10
When minimised, windows apps are visible in the alt/tab win/tab screens. Plus an "launched" app indicator is visible in the taskbar
Actually if I minimise franz the window isn't listed anymore in the alt/Mtab and the icon in the taskbar isn't indicating the app is opened.
@NNois I'm not sure, but this might be expected behavior? @adlk please clarify
nope this is not the expected behavior at all... every other windows apps leaves an highlight even if they are minimised, this bug leads to windows unability to list the windows in the alt-tab win-tab
In the screenshoot bellow every apps are minimised and the desktop is fully visible, franz is running too

+1 for me it's the same issue.
The app disappear from the taskbar, althought the app still open.
+1 Same problem here on Windows 10
+1 , same issue for a while now
Try right-clicking Franz in the tray/notification area and clicking "Show Franz". This at least displays the window again properly.

But I agree the behaviour is not ideal - when you close the window (as opposed to minimising), it seems deactivated on the taskbar (while Franz is running in the background, which is ok). But when you click the taskbar icon again the taskbar icon doesn't become active until you click "Show Franz" again in the tray.
+1, same issue. Tried reinstalling and deleting Franz appdata folder.
So? Any news? this still happends to me
Same. It shouldn't go to tray when minimized. It should minimize to the task bar. I think it used to minimize to the task bar but it changed to system tray one day... Can't Alt+Tab to Franz anymore...
Same here. Pin to taskbar works partially, but would love to just alt + tab back into it.
+1 I've also had this issue for a while now- Uninstalled Franz/Deleted AppData didn't solve the issue.
+1 Same problem here on Windows 10
+1, my task switching habits make Franz hard to use on Windows
Today Franz reappeared in my Alt+Tab menu.
I didn't consciously update neither Franz (on 5.0.0) nor Windows, not sure where this came from; nevertheless the problem seems solved, propose closing the issue.
Today Franz reappeared in my Alt+Tab menu.
I didn't consciously update neither Franz (on 5.0.0) nor Windows, not sure where this came from; nevertheless the problem seems solved, propose closing the issue.
I'm still having the same issue - propose not to close the issue.
The update fixed my issue. I'm fine with this issue being closed.
This fixed my issue;

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
Most helpful comment
Try right-clicking Franz in the tray/notification area and clicking "Show Franz". This at least displays the window again properly.
But I agree the behaviour is not ideal - when you close the window (as opposed to minimising), it seems deactivated on the taskbar (while Franz is running in the background, which is ok). But when you click the taskbar icon again the taskbar icon doesn't become active until you click "Show Franz" again in the tray.