If i bind left click to A and Quick Move to B the following happens (Switch Pro Controller layout):
-Picking up an item is still bound to B
-Hitting A quick moves still
-Hitting B while holding an item places only one (like the Y button does) and it doesn't place any on the first press
-Hitting any of the 3 buttons while holding an item and hovering over another swaps the two, even if you hit quick move. (By default quick move moves the item out of the slot you're hovering over while keeping the held item in your cursor)