Hello. We use O365 Business Essentials and Business Premium. Our organization contains exactly nine people. With an org chart as flat as a desert.
The Organization tab is absolutely getting in the way, removing visibility to more important tabs (for us) like an Excel tab. So, instead of having the important tab "in your face" we have to tell the user... go to the little down arrow and there you will find what you are looking for - while there is a tab with a very long name just using real space.
Also been unable to move any tabs before the Files Organization Activity tabs.