Yes, you can adjust the boot order so your M.2 drive comes first.
Yes, you can adjust the boot order so your M.2 drive comes first.
Your first boot starts with Windows Boot Manager, but you're wondering if moving it to an M.2 drive would work. The three options are: using the Windows Boot Manager, WD Blue SN570 500GB, or keeping it in P0. It seems the P0 designation is linked to the ST2000OM008-2FR102 model, so relocating it to an M.2 slot should be possible.