mortherboard

hey, guys, I need some help. If a New M.2 SSD running PCIe Gen 4 is installed into the M2A_SB socket, should I have access to the whole SATA bus? I know if I have an M.2 SSD in Socket M2M_SB I lose access to ports 4 and 5. I just installed a 2nd M.2 SSD now, and it appears they are sharing...