Often when I’m placing painters or crystal gens, i’ll run a pipe on layer 1 on top of the belt on layer 0, then hook up the pipe to the machine by dragging from the existing pipe on layer 1 to one tile over, then hit Q to go to layer 0 to connect to the machine. Currently, the UI remains at layer 0. I think it would be a nice QoL improvement if the game returned to the original layer on release of the mouse button when the layer was changed during the dragging.