openSUSE LEAP 42.3 Disappeared From Boot Menu

I have several linux distros installed. Today, after updating Ubuntu 16.04 LEAP 42.3 disappeared from boot menu. I suspect it’s due to the BTRFS file system that other linux distros doesn’t recognize. I re-installed LEAP and it is the first distro in my boot menu and recognizes all other distros. Is there a way that I can ensure that I always boot from openSUSE Leap? I will appreciate all help.

When installing others be sure that they don’t change the boot ie leave openSUSE in charge. You would then need to boot to openSUSE and reset grub so it knows of the new OS. Easiest way is in Yast -boot option

Thank you.