It's not very intuitive : open your status menu with ESCAPE, and then push ENTER. On a controler, must be B and then A. This is one of the priority stuff I'll change and correct when I'll come back to this project.
I actually tried that... turns out for some reason it wasn't working for me couple of game resets. Worked like a charm on another PC though and I aunched it just now and it works again. Guess there was some kind of bug beforehand :( Maybe some background program was taking input - not sure..
I tested on two different PCs and didn't encounter any bug like that, but then again it's super buggy so it wouldn't surprise me if the inventory was also broken haha. Thank you for having the patience of trying it on another pc :)