By default, a project becomes active as soon as it is created. When a project is active, configured evaluators check for pending jobs that they can pick up and evaluate. If you make a project inactive, evaluators will complete any tasks currently underway but then quit checking the project for pending tasks.
You can make a project active or inactive in one of two ways:,
On the Projects page, use the project's Active toggle:
In the project details view, select the Properties tab, then use the toggle on the toolbar: