Negative Search feature allows you to perform a search for Plugins or Themes whose results will exclude the desired keyword.

For example, performing a search for active plugins across your Child sites using the “Hello Dolly” as a negative search keyword, will display all Child sites which do not have the plugin “Hello Dolly” installed and active.

The toggle button is disabled until the keyword term is entered.

Negative Search can be performed for Plugins on  MainWP > Plugins > Manage Plugins page, and for Themes on MainWP > Themes > Manage Themes.