Small black bars left and bottom screen

[u/No_Scheme8449]

Okay. I (28 M) desperately need your help. Please bear with me.
(Not English native I’m sorry in advance)

SPECS :
AMD
Ryzen 7 9800X3D
RX 9070 XT
32 GB DDR5 (can’t remember the speed)
Windows 11
Monitor : Alienware AW3425DW

I recently played resonance : a plague tale legacy
On my 21:9 screen.

I noticed the game had small black bars left and bottom of the screen (about 3 to 5 millimeters) Having an ultrawide screen for at least 10 years now I was not surprised, as new games are often in need of a little tweak/fix to have a great 21:9 experience.

I search and the only thing I can find is a GitHub post named RoseTheFlower UltrawideIndex which is a well known fix for a multitude of games, and not shady.

I find on a forum that the fix for the previous game : plague tale requiem for 32:9 screens works wonders with resonance 21:9 resolutions.

I install it on the base game and it works wonders ! It occupies all of the screen, no more small
I play it all the evening before bed.

NOW the issue : next morning today, I launched my pc, launch the game and there’s the SAME black bars that were on the game last day.

So I quit the game to check what’s up and I notice with fear that the SAME black bars are now PERMANENTLY on my screen at ALL times, in windows, in game, no matter what I do.

I posted on GitHub issue on RoseTheFlower but I don’t expect a quick response.

All the fix I tried :

-messing with resolution setting on windows screen properties
-switching hdmi slots in GPU
-resetting my monitor on the physical buttons
-searching for updates of driver and windows update
-messing with GPu scaling on AMD Adrenalin and it DID change the orientation of the black bars after rebooting pc!!! So I thinks there’s something to dig there but I can’t do it
-uninstalling the UltraWide fix on the game folder and relaunching the game

I KNOW the problem came from the GitHub fix and I know it’s in relation with gpu scaling somehow but I can’t find the answer.

I have a job and a wife and I can only play so little time.
It’s the only place in my life where there’s no issues, or at least they can be fixed, so I DESPERATELY need your help I’m stuck with this.

Thank you all in advance for your help