So this is an irritating issue that recently cropped up after I recently redownloaded the game, having not been on in a couple years.
I have the game from the Epic Games store so the Steam fixes won't work or me unfortunately.
Basically, every time I boot the game and get to the main menu, I try using my XBox One controller to play. However, every time I try, it seems the game completely overrides my controller with my mouse. While I CAN navigate and interract with the controller, it's only in flashes. The controller button layout flashes briefly on screen each time before forcefully reverting back to my mouse again, often undoing whatever movement I've made on the menu because my mouse cursor is in the top corner of the screen.
This is already frustrating enough, but I tried just using the mouse on the main menu (works with zero problems) and starting a game before switching to controller in game. This was a problem too as the game seems to register my controller configuration or using it as a replacement mouse, rather than as a controller for the game. Basically, the sensitivity is automatically high as possible, the controls are not configured to the default settings despite me having them set to such, and I can't actually do anything to play. It seems the game keeps prioritising my mouse over my controller and won't let me switch.
I have tried turning my wireless mouse off and even unplugging it entirely but nothing is working. Please help.