Help with Select Bugs and Autopilot bindings on Xbox

Forgive my noob question but what do the “bug” bindings do and why are the controls duplicated for autopilot as well? Highlighted in red in the screen shot. Description on bugs say select the bug “for use with +/-“ but controller doesn’t have a plus or minus

So I know what the bugs are and what +/- is on the controller is now- my question now is why are the binding duplicated for autopilot holds on the default layout? Seems confusing.