That's good that you disabled the fast boot.Hello friends,
My laptop model is MSI GF63 Thin 10UC-672XTR Intel Core i7 10750H 512GB SSD freedos.
I downloaded Ubuntu 20.04.3 LTS from official url.
My old laptop was also ubuntu on that platform i used to create startup disk creator tool and wrote to the iso to usb stick.
As you said i used F11 but couldnt go the usb than i thought maybe there was a priority problem and i used DEL shortkey to enter bios.
I disabled fast boot and used firstly i selected usb.
When I restarted to laptop, bios screen opened and althought i enter F10 for save and exit again and again bios screen came.
Is that any configuration should i open or close for bypass bios screen.
Thank you for helps.
Then figure out your boot keys like f2 f11 f12 what ever and the usb should appear most all linux can run off a usb drive as live usb.