Remove sites from WPMUDev after converting to multisite?

New to multisite. The sites are working fine, but I am not sure how the Network Admin works as opposed to each site individually. Looking at my dashboard on, I see all sites there. And plugins to be updated that I have gotten rid of, or are network activated. I thought once I had this completed, if I network activate a plugin, I don't need to update per site. Do I need to remove all my sub domain sites form WPMUDev dashboard and just manage them from the primary domain?