Steam Deck Plugin Loader to modify the nested resolution as seen by your games.

Installation:

1. Ensure you have Steam Deck Plugin Loader installed
2. git clone https://github.com/loki-47-6F-64/gamescope-mode-change.git
3. cd gamescope-mode-change
4. git submodule update --init
5. Copy gamescope-mode-change to /path/to/homebrew/plugins/gamescope-mode-change

Main page:

• This is a complete list of all Non-Steam games in your Steam Library
• By clicking on an app, you'll open the settings page for that particular app
• By clicking on Save settings, Gamescope-mode-change will remember your settings even if the toggle has been set to off.

Settings page:

• By default, Gamescope-mode-change will set the resolution to the native resolution of your current monitor.
• If Super Resolution is toggled off, the resolution will be set to Native or Width/Height, whichever is lower, otherwise it will force your configures Width/Height
• If either Width or Height is set to Native, Super Resolution will effectively be set to off.
• By clicking on either Width or Height, you'll be able to set the Width or Height respectively.

Dial page:

• Should be pretty straightforward

Gamescope-mode-change works by modifying the launch options of your game, wich will make Steam run a script right before starting the game.

--fullscreen

becomes

/path/to/homebrew/plugins/gamescope-mode-change/gamescope-mode-change.py --id=1 --nestedWidth=${width} --nestedHeight=${height} xX-gamescope-Xx && %command% --fullscreen

and

ENVIRONMENT_VAR=VALUE %command% --fullscreen

becomes

/path/to/homebrew/plugins/gamescope-mode-change/gamescope-mode-change.py --id=1 --nestedWidth=${width} --nestedHeight=${height} xX-gamescope-Xx && ENVIRONMENT_VAR=VALUE %command% --fullscreen

If you wish to change launch options for your game while the script is active, be sure to do so after xX-gamescope-Xx && . <- please do not forget the extra space after &&

Good luck :)