Well that was easy as pie. I read a lot of forum posts where using efibootmgr they were able to remove all those entries, but they always reappeared after a reboot.
A couple of posts suggested deleting the folders in /efi/boot. So I first used rm to get rid of the folders via CLI and then used efibootmgr -b [000n] -B to remove each entry I needed gone. As each one was removed, I ran efibootmgr again and checked for the next correct number, just in case they got renumbered after removing one.
The final one was the Linux Boot Manager folder which I had not used rm to get rid of yet, as I was unsure why I had one. So when it came up as the 1st to boot, it was the old EndeavorOS entry. So I repeated the rm of that folder in /efi/boot & used efibootmgr to get rid of the entry.
Once I did that, the computer booted to the current installed OS menu of OpenSuse, since I installed both Leap & Tumbleweed, and I could choose from either of those upon boot, or after 5 seconds, it auto booted to the first entry, Tumbleweed.
I am now going to install one of the other distros I am wanting to test, over Leap, and see if I can get the normal grub menu. I did not care for Leap. I may not even keep Tumbleweed, but I did want to test it out.
Sheila