@bdd2298
I reviewed your post and I understand that you are trying to boot from the USB drive and unable to find the legacy support setting in the BIOS.
Don’t worry, I assure you I will try my best to get this sorted.
I recommend you follow the steps in the below article to disable secure boot and it will automatically enable the legacy support.
https://support.hp.com/in-en/document/c04784866
Let me know how it goes and you have a great day!
P.S: Welcome to the HP Support Community 😊
If you wish to show appreciation for my efforts, mark my post as Accept as Solution. Your feedback counts!
Cheers!
Stay Home – Stay Safe
The_Fossette
I am an HP Employee