You can see all your archived projects in dimmed color once you enable the “Show Archived Projects” option in the sort dropdown:
You can activate an archived project if you're the Owner or an Admin. Hover over the project and select “Activate Project” under the Settings menu:
☝️ If you’re on the Organization plan, archived projects will be listed in the section they were in. Organization members with an Editor or higher role can activate them.
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