If you are trying to hide everything (sidebar, tutorial, navigation buttons), then it tells me that you are trying to do something quite different with Teaming than was intended. Removing both the sidebar and the navigation will make it very hard to move between folders or workspaces.

However, if that is what you want, then I would suggest that you look at using the control that are available on "Landing Pages". They will let you remove the sidebar permanently, remove the navigation links, remove the toolbars and also the search buttons and the other info at the top of the page. To do this, edit the User Workspace definition using the Form and View Designer on the Site Admin page to add a "Landing Page" element onto the form and view. Then you can edit the User Workspace Template (from the Site Admin page) to select the default settings for the landing page controls. (I think this will work but I haven't tried it.) Then, all new users will get this new look. (Pre-existing user workspaces will not change.)