Question PC boots to BIOS

[mozcaf]

I have a newly built PC with ASUS ROG Z390E motherboard and Ubuntu installed on a M2 NVMe drive, Whenever I boot the system always boots to the BIOS screen not directly to the OS
I tried disabling the SECURE BOOT, resetting the CMOS and even flashing and reinstalling the OS
The problem still persits, can someone give me a solution to boot directly to the OS

 

[jsmithepa]

After entering BIOS the first time, did you hit the SAVE, typically F10, button?

 

[mozcaf]

After entering BIOS the first time, did you hit the SAVE, typically F10, button?

THANK YOU so much It works