With OX App Suite 7.10 a new concept of starting applications was introduced and replaced the tabs from previous versions.
By default you can switch the applications in the upper right part of the screen on the icon which looks like a numeric keypad.
It is however possible to enable a quick launcher to have the most used applications on the left side.
First you have to set the default configuration:
vim /opt/open-xchange/etc/settings/appsuite.properties and add:
This will enable three new quick launchers, mail, calendar and drive. 3 is the maximum.
To make it possible for the user to change the applications you have to un-protect the setting:
io.ox/core//apps/quickLaunch: protected: false
Note: as in all yaml files: the leading spaces (4) on the second line are important.
After a restart or
reloadconfiguration of OX App Suite and a re-login you should see three new icons on the left. If you also un-protected the setting you can change the applications in Settings/Basic settings.