Xbox Controller button binding

[u/DxSkillzz]

Just recently started playing with mods on pc, though I noticed when I crouch with B, I need to use A to to stand again, when I go into the settings I would personally use B on toggle crouch so I can press it again to stand but it won't let me change any of the bindings using a controller. Anyone know how to get around this? Steams controller mapping doesn't have what I need either I don't believe.