2.1 While NUC is powered OFF, press and hold the Power Button. Count 1001, 1002, 1003. 1004 and release the Power Button.
2.2 NUC should boot into Power Button Menu.
2.3 While you see the POwer Button Menu, press F2 to enter BIOS settings.
2.4 Press F9 (confirmed by "Y"), to set BIOS to default settings
2.5 Press F10 (followed by "Y"), to exit bios and boot to Windows.
2.6 Now if you want, you may enter BIOS again and perform your requested changes in settings. However, do not change graphics settings. Those settings are used in BIOS only.