when the cover is off the bike then you can, indeed, turn that "lobe" past the arm.
there is a rod with 2 balls attached (not what you think!!), that pokes out of the clutch centre. it will apply pressure from the clutch springs against the matching indentation in the arm. after you install the cover the "lobe" will stay behind the arm unless there is another problem.
so put the lobe back where it belongs, put the cover back on and it should be all good.