This is not an OpenMandriva issue.
Nor a Calamares issue in my opinion since it’s how it works by design.
Any problem with Calamares itself must be reported upstream, as well as any new feature request if you believe you can give useful suggestions, at their Issue Tracker.
We provide a good number of how-to and tips&tricks in Resources (if only users cared to read the f* documentation.. 
) also related to the system install.