@Volker_E are there any plans to fix oo-ui-menuLayout-menu for mobile. On the preferences page I see 4 lines of buttons. It would be great if at the very least these were made horizontally scrollable (which I believe this stylesheet did on the old design). Is there any tasks tracking menuLayout on mobile (with large row of horizontal buttons?) Is https://gerrit.wikimedia.org/r/463382 related in any way?
Note that this issue also applies to other skins. Pretty sure at least Vector and MonoBook also had custom styles for the preferences page, which can be removed now. (Probably should have a separate task for other skins.)
I don't think we have plans/task. In my opinion wrapping is preferable to horizontal scrolling (definitely on desktop, and probably on mobile as well?), but it's definitely something that could be changed. I will note that in some cases we already can do scrolling instead of wrapping here (when the tabs are absolutely positioned, and wrapping them would cover content below), but I'm not sure if that is actually used in practice anywhere.
Probably a better design for mobile would be to display each section separately (on a subpage?). That should be doable, but not trivial. (I don't think I have the time to work on that.)
Is there any tasks tracking menuLayout on mobile (with large row of horizontal buttons?) Is https://gerrit.wikimedia.org/r/463382 related in any way?
Well, the MenuLayout/TabSelectWidget buttons do wrap over multiple lines, so that particular patch doesn't apply to them.