Deactivate Plugins on your Child Sites

If you need do Deactivate plugins on your child sites go to: MainWP > Plugins > Manage tab, select wanted child sites and in the Status dropdown menu chose Active (a plugin needs to be Active in order to be Deactivated):

Click the Show Plugins button. After that, in the Choose Action dropdown menu,  you will have the Deactivate option:

To Activate or Delete a plugin select Inactive (a plugin needs to be Deactivated in order for it to be Activated or Deleted).

To only View or Ignore plugins select All Plugins.