On restart PC is requiring that I setup BIOS. I have to manually select my Boot Drive every time. Is there a Fix?

I have a Z170 Pro Gaming Motherboard. It is requiring that I manually select the boot drive every time when it posts. I have done some research, but have been unable to remedy the situation myself. Anyone have any suggestions?

Edit: Here are some pictures from the BIOS.

http://ift.tt/2EjH8oU

Submitted December 30, 2017 at 11:50PM by send_me_the_nudes http://ift.tt/2DCq1Oi