Can I force my Darktide launcher size?
Maybe via steam launch options or in some .ini file in the darktide dir?
On my PC the launcher looks like this:
This is across two screens, the black area doesnt exist.
On my steamdeck it looks approximately like this:
Its very hard to click on the ok button to launch the game on the Deck.
I suspect this is partially my own fault on the PC as my screens are a different resolution + aspect ratio, and Darktide is not officially supported on the Steamdeck as of yet (although let me tell you, it just works! thank you for not putting anti-cheat on DT FS 
)
so Im happy if anyone just has a window resize solution
