Zorin doesn’t stop you from entering BIOS. Please see: https://www.tomshardware.com/reviews/bios-keys-to-access-your-firmware,5732.html
When you boot, the splash screen (of your manufacturer) will tell you in the bottom of that screen what key to press to enter BIOS. Tap that key (don’t hold) to enter BIOS. On a laptop, no need to press the Fn key if the BIOS key is a function key.