Changes visibility of a blog after it has had no activity for a specified amount of time.
Hide Inactive Sites Download Now
(If the link does not work)↓
Originals Link WordPress.org
How to Install Hide Inactive Sites Plugin, Manually
Copy the plugin files to
Network Activate plugin from Network Plugins page
From Network Admin dashboard, go to Settings -> Hide Inactive Sites and adjust settings.
Plugin Not Working?
If any errors or problems with the plug-in then write comments.