MTG Arena switches to windowed mode constantly for ultrawide aspect ratios
As of 2024.40.30.6688.1090994, everytime my client enters or exits a match the game switches from fullscreen mode to windowed mode. The issue only happens when I'm using an ultrawide resolution (3440 x 1440).
The cause of the bug has actually been found by nexus mod user skebbZ, attached is his explanation. (His mod actually fixes this issue)

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jonesy#59724 commented
I'm having this same issue. I have to switch to full screen after every game.
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ORNG#26970 commented
This bug absolutely wrecks my experience in the game. Please fix it
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Steelhart#99839 commented
I finally logged in to see if this was fixed after a few months of just playing in Windowed mode. Sadly, the swap back and forth is still there.
Alt+Enter will make it full screen until state changes. Like:
Entering a Match loading screen
A Match Opponent is Chosen
Match load in
Entering the Lobby after a Loss to Black Discard -
raeuk#58351 commented
I've been wishing this was fixed for years...
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Rick Astley#23800 commented
I am amazed you folks haven't devoted any energy towards fixing this bug.
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chumppi commented
This has been an issue for years now, please fix.
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BrandeX#11055 commented
This affects all ultrawide resolutions, e.g. 2560 X 1080.
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platycus#08338 commented
This is ridiculous this still isnt fixed
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Theowlguardian#51832 commented
This is happening to me as well, is there a fix yet?
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nj_vash#21435 commented
Hi, sorry for the question, I didn't quite understand what I need to change to ensure that the fullscreen problem no longer occurs
A thousand thanks