I have the same problem as described in this post:
The icons are displayed correctly on my PC, but unfortunately not on my mobile devices (Android, iPad).
Collabora Online is installed as an “built in” Server in Nextcloud on my Unraid NAS System.
Hey @anym001,
I know it’s been a while, but thanks for the question.
Is this still an issue on the latest version of Collabora Online?
I have only been using CollaboraOffice on Android and just found out that the icons (Datei, Bearbeiten, Ansicht, Einfügen, Format, Tabelle, Daten, Extras, Hilfe) are supposed to appear.
hello @A1391 welcome to collabora online forums 
Can you share the version info of the android app where icons are still missing ?
I have this snapshot of collabora office android app and i can see all icons are present
Version:
