How do I remove Spaces from a Project?

Select the Project you’d like to manage in your list of Projects in your sidebar menu on the Spaces tab.

Hover over the file card of the Space you would like to remove from your Project and click on the (...).  You will see the option 'Remove from Project'.  Choose that option and that particular Space will be removed from the project.

Another way to easily remove a Space from a  Project is to hover over the bottom of the Space within a Project and click on the Remove from Project icon.