Appstore not visible in mobile view

Hi, i am using nextcloud from my mobile device for most of the time and for some time now i was wondering if the appstore was defect and tried to fix it, but there was no missing folder like reported on other threads about that. However, today by coincidence i was sitting at my laptop and found out that actually the appstore just works, buton mobile devices there is just no way to show the left column that contains the categoryselection, so i am trapped in the installed apps category.
Is this by design, or an accidental limitation? Also i have a feeling that not all apps handle the left sidepanel the same way, is that nota general feature any app can make use of?

Any idea on this? Its somewhat annoying