I play a lot of FPS games on PC and I generally use:
Aim Down Sights = Right mouse click(toggle)
Sprint = Hold Left Shift
Crouch/Sneak = Hold Left Cntrl
Unfortunately, there is no option to change the toggle/hold in The Outer Worlds. These are set completely backward to what I am used to so when I swap between games, I'm all messed up. It more or less makes The Outer Worlds unplayable for me because of how frustrating it is to move/aim during firefights.