When opening the Share view (by clicking on the Share tab), you will see two lists:
- The projects others have shared with you (
Shared with me). - The projects you have shared with others (
Shared by me).
In the second list, you will be able to edit the people you share your projects with, or even stop sharing. Just hover over the project name and the Edit sharing button will appear, which will lead you to the Sharing Panel.