Sorry if this has been posted or discussed before-
I have an issue with certain programs (Spotify, MusicBee, maybe others) where, if I try to maximize those programs on my main monitor (1440p resolution), it only shows the area of the application that would fit on my secondary monitor (1080p resolution); the rest of the window is invisible, but I can still interact with it. I have embedded a screenshot of the problem.
Thanks! I wasn't able to reproduce that here with the same monitor layout as yours. Could you backup your DisplayFusion settings (Settings > Options Export) and attach them as well?
Window Management -> Move newly opened application windows to the current monitor
While I had that setting enabled, Spotify would open on my secondary 1080p monitor, and I would have the invisible resolution issue. I just disabled the setting and it seems to have fixed the problem.
edit: Also, after enabling the setting again, the problem reemerges.
If I start the application and it opens on my main monitor, I do not have the resolution problem. I can move it back and forth between the two monitors and use both the full 1440p (main monitor) and 1080p (secondary monitor) resolutions. However, if I close the application while it is on the secondary monitor, the next time I open it, it will flash briefly on the main monitor and quickly switch to the secondary monitor; after this, I consistently run into the invisible resolution issue as described before.