Run Updates on Staging Sites

To run updates on your child sites,
  1. Login to  your MainWP Dashboard
  2. Go to the MainWP > Updates page
  3. Select Staging Sites
After selecting the staging sites, updates will be performed only on staging sites. After you verify that everything is ok on the staging sites, you can run updates on your live sites.

Source Article: https://kb.mainwp.com/docs/run-updates-on-staging-sites/
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