Comment # 8 on bug 1175139 from Stefan Hundhammer

That other bug #996598 mentions some significant improvements in this area:

https://github.com/yast/yast-storage-ng/pull/1160

Unfortunately, there is only a "before" screenhot, not an "after" screenshot
showcasing the changes. But since you are using Tumbleweed, you can easily
check that in the latest YaST expert partitioner.

AFAICS that should address the core issues of this bug report, the partitioner
UI.