What sets the Dolphin full screen resolution setting? (Besides INI)

[Scribblette]

TLDR: Dolphin matched 1440p full screen resolution on primary monitor, then matched 1080p monitor on secondary monitor when put there, but then doesn't want to go back to 1440p without my modifying an INI file.

Long version:
So this thing you've made here is marvellous. I've been streaming to my TV from my PC via Steamlink and the kids love their papa's Xenoblade game time.

To start with, I played it on my primary monitor at 2560x1440 with Internal Resolution x4 and minimal drama.

When streaming I lowered it to IRx3 and it rendered at 1920x1080 on my secondary screen when dragged over there, again without drama.

However I tried playing again today and raising the IRx4 and putting it on my primary display in full screen refused to use anything but 1920x1080 (wasn't keen on playing borderless fullscreen).

I had to go into the INI file to adjust the FullscreenDisplayRes = 2560x1440 to fix it.

Is there a setting somewhere within Dolphin itself that I'm missing? Any ideas why did it work to begin with, but then not in reverse?

[MayImilae]

You don't need to change the fullscreen resolution at all, it's unnecessary except in extremely niche cases. Just let your OS control your displays' resolution and as you move Dolphin between windows, it will just use what Windows gives it, easy!

[Vajra]

i can get dophin in full screen using stretch to screen but i dont think its optimal. my pc uses 1920x1080, but dolphin doesnt have an option to change FSR. Is there a way to force dolphin to run at my resolution without changing the internal one?