How to Boot a trial Zorin USB with Ubuntu and Grub-2.04

Dell 1-3 8GBm, 20.04 Ubuntu. Created Zorin 16 USB flash drive but it doesn't show up in the Grub Boot menu. What is the terimall command to boot for a trial?

What youare looking for is "LiveUSB not showing in boot order"
such as the case here:

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