Make sure to check ProtonDB for a game if you’re having problems. I think jsdz’s answer should work. For extra context, SwGame-Win64-Shipping.exe is a DRM-free executable whereas starwarsjedifallenorder.exe has Origin/EA DRM baked in. Setting your launch option to “path/to/SwGame/Binaries/Win64/SwGame-Win64-Shipping.exe” %command% like they report in ProtonDB should work.
(There’s actually some tiny bits of DRM in SwGame-Win64-Shipping.exe but they allow runtime even when they fail so it’s similar to DRM-free for practical purposes)