There is few options to enter bios settings. I'll will describe the two and easiest methods:
- After depressing Power Button to power ON your NUC, repeatably depress on F2 key. After you will see the F2, F7, F10 menu (in right lower corner), the NUC will boot into Bios settings.
- The other method to enter UEFI bios is from Windows 10:
Enter Windows Settings > Update & Security
Press Restart now - Windows will reboot into Advanced Menu
Press Advanced Options
Press UEFI Firmware Settings
Hope this helps