I haven't found any workaround for this, and didn't get any answer for my first post, so I'm kinda reposting (sorry for that)
So I noticed I can't use the definitive editor, because the camera doesn't work. It is there, but I cannot move it with my mouse, cannot change the orientation, cannot zoom in/out with the scroll. Only wasd/arrows make the camera move, but not always on the first try.
I also cannot use any interaction mode.
In a basic level, the mouse controls in play mode won't work either, I can't even click on the terrain to make the dummy move. It will sometimes move if I click outside of the terrain.
The thing is, scrolling, right clicking, and changing the camera orientation does work in the 3D preview.
The definitive edition game and the classic engine both work perfectly.
If anyone has any pointers to how I could resolve this (like a specific configuration of the engine?)