there is not much else to say aside from it not going back to normal Steps to Reproduce:
[Please add the steps that can help our QA department in reproducing the issue. For example:]
be loading
chat in discord
load in and go back to the game
your mouse should be unlocked and not lock after going into menus
I had this happen as well, but it was mid-level so I was frantically trying to survive and didn’t take stock of the situation. I just restarted my game quickly and rejoined the level in progress.
What happens is the mouse is no longer locked to Darktide. As you use your mouse to look around in game, it can slide to another monitor, then select another program when you click. This takes focus away Darktide, and makes all of your keyboard/mouse inputs go to the selected program.