The Xbox 360 controller has no hardware sensitivity dial, but PC software gives you granular control.
Most modern PC games expose "Look Sensitivity," "Aim Sensitivity," or "Controller Sensitivity" sliders in Controls/Gameplay menus. Adjust per game.
Settings → Bluetooth & devices → Mouse → Pointer speed. Affects cursor; some games read raw input, others don't.
Caveat: In-game settings often override external tools. Set game sensitivity to default/medium first, then fine-tune externally.