Kamparo owners, need some info on this adjustment please

Hey fellas,

Do you ever adjust this piece when setting up or tearing down? This is on the center bow and there seems to be a hole only on one of the center vertical pole, not sure why the pole on the opposite side has no hole in it. Moving the adjustment to this hole does seem to tighten up the canvas some but not sure if it should be kept at this position during closing of the tent. This adjustment affects the rear most bow but I don't usually monkey with this adjustment it but am curious if any of you play with it on your normal setups. I'm now in the habit of adjusting the center and rear bow during setup to tighten up the canvas and then dropping the poles before closing.