Making a Project active allows Listings to be assigned to the Project, where as making a Project Inactive will not allow listings to be assigned to the Project.

To make a Project Active or inactive open the Project Module 

Select the status toggle for the Project you wish to make active. The toggle will change to green when the Project is active

To make the Project Inactive select the status toggle for the Project you wish to make inactive. The toggle will change to grey when the Project is inactive