Expected behavior
You can select a private app for quick access.
In DC-Desktop, this app is pinned to the chat bar.
In the mobile versions of DC you can access this app by swiping left in the chat view.
Actual behavior
There is no quick access to private apps.
Explanation
It would be convenient and time-saving if you could quickly launch frequently used apps this way.
Example Images
Private app pinned at the chat bar in DC-Desktop: