Can I un-assign a user from several projects, in one step?

Yes, it is possible to un-assign a user from several projects, in a single step. This may be done as follows:

1. Open the user’s profile page (accessible through  Administration => Users > Users ).
2. Near the top of the main frame, click on the “Assigned Projects” tab.
3. In the subsequent page, check the projects to un-assign.
4. Click on the “Un-assign selected projects” option in the right pane.