Found a solution. Just turn off Secure Boot in BIOS. An alternative is the first pinned comment by Dimitar Doichinov of video on YT entitled: How to enable boot from DVD and USB option with UEFI boot mode enabled How to boot from USB:  Press F2 -> BIOS:  General -> Advanced Boot Options -> Enable Legacy Option ROMs -> Disable Secure Boot -> Secure Boot Enable -> Enabled  Apply changes and exit, restart, then press F12:  Change Boot Mode Settings -> Click and ESC after this to restart  Press F12 -> Choose USB device from the Boot options Using his method, I was able to see various USBs, including one created today with E2B, but trying to boot from it yielded a "Secure Boot Violation" because Secure Boot was still enabled. But I was able to use this method to boot from a bootable Windows installer prepared a few years ago using Rufus, which I was unable to even see in F12 menu during earlier attempts as described in this thread. You can also turn off Secure Boot from the F12 menu (and turn back on from F12 menu as well). In any case, by turning off Secure Boot, I was able to boot a couple of different 64GB USB sticks (so no need to worry about using a 2GB stick - it's 2022, who even has these anymore?), including a multiboot USB I created today using E2B and AGFM (this creates 2 partitions, one NTFS, one FAT32 - the FAT32 is used for UEFI booting, but once booted into AGFM, you can access ISOs stored in the other partition). My older E2B USB won't work, because as Ron said earlier, it's not compatible; you need that second, FAT32, partition for UEFI booting. Why would someone want a multiboot USB? It allows you to access various utilities and installers, all from one USB stick. So one could have backup/rescue ISOs such as Macrium, Acronis, etc., antivirus ISOs, disk utilities such as GParted, installers for Windows, Linux distros, etc., again, all on one USB stick. After this, you will probably want to turn Secure Boot back on, which you can do from BIOS or from F12 menu. Ron, I appreciate your help and patience in trying to figure this out. Maybe someone who runs into the same problem will find this thread and hopefully it will sort them out. Or just reply and Ron and I will see it.  
I did a fresh install of Windows 10, using USB (was able to boot from USB then). After the Windows install, F12 no longer presents the option to boot from USB. In trying to be able to boot from USB, I made the following changes (kind of flailing around trying to find a solution): BIOS: Secure boot disabled BIOS: UEFI Booth Path Security in BIOS to Never Windows: turned off Fast Startup Still no option to boot from USB. F12 presents the following: UEFI options: Other options: Any ideas?
XPS 8930 - how to boot from USB?