Best way to get LMMS (working) is to use this repository for openSUSE.
https://geekosdaw.tuxfamily.org/en/
I use it my self, and have LMMS with Carla.
After install you can also easily add your self to the audio group. There is in geekos a tool for that, which you can just click.
When you click install, you will download an .ymp file.
Open this with YAST. Right click, and pick install with YAST.
I have been using this for months now.
Two other options, one is to contact the LMMS package builder for openSUSE, and tell him of your problem.
Or use the applmage file:
https://lmms.io/download#linux