Carbonio Client - no logout available from mobile phone (Android)

I have started using Carbonio on PCs - seems to work fine. Logout button is displayed at top right. No problems.

But having successfully logged into my client account from my mobile phone (running Android), and using Chrome (not the app), there simply is no Logout button. The "Settings - General Settings - Accounts " provide nothing related to Logout. Even after force closing Chrome, I am still logged on when I open Chrome. Surely not the intention?

A missing (essential!) feature og a bug?

I am not the administrator, just a concerned user...