Confused wife needing help

Apologies if this isn't the place for this, but I'm completely at sea. I tried to play this game with my husband on his Series X recently and could barely handle walking. I'm a few years older than he is and grew up with inverted controls. We figured out how to invert up and down, but not "movement." I've tried searching it and don't really understand as I've never played this before. I fear it must not even be an option with this game? Someone please help, I just want to be able to run around and shoot him successfully but I'm thinking I'm probably just going to have to finally get with the times and relearn the controls.

TIA!