1.1.2.12  The installation process:

https://doc.opensuse.org/documentation/leap/startup/html/book-startup/art-opensuse-installquick.html#sec-opensuse-installquick-inst-process

Not sure what to suggest here - the doc says:

"After the installation routine has finished, the computer is rebooted into the
installed system. Log in and start YaST to fine-tune the system."

I installed from a flash USB drive. After the installation was complete and the
reboot was started, I was fearful of removing the USB drive - I did not want to
pull any rugs out so to speak. As expected, the system rebooted just fine back
to the start of the installation screen on the USB drive. Not a huge problem -
I just did a power on reset to start the boot again and and did my usual esc
key sequence to get to my boot setup where I could switch the drive order so
that my linux disk was first priority. I then removed the USB drive and
rebooted just fine to the new system. 

Like I said, not a problem. I guess I was curious if there was some magic that
the installation process was going to perform to actually reboot into the newly
installed system, thus bypassing the USB drive that was still inserted. The
answer in my case, of course, is no - but I was not surprised and maybe
actually happy that such magic was not possible since I would much rather
retain control over the boot process. I guess I might only suggest that some
mention of removing the installation media is required to allow the reboot to
the real system and not right back to the start of installation process.