[xwiki-users] How to disable the workspace menu ?

Hello XWiki admins, I just upgraded a wiki farm from 2.7 to 3.5. No particular problem encountered. The only annoyance is the MAIN new menu that appears on the top menu bar. I prefer to hide it, the time to understand what is "Workspace" and how it works in a XEM context. What is the easiest way to disable this extra menu ? Thank for your help. Maxime