Boilerplate Posts
After publishing a boilerplate post on your child sites, the post looks normal, just like any other WordPress post. After it's created, the post will be visible normally in the WP > Posts > All Posts page on child sites. However, on the MainWP Dashboard side, the list of created Boilerplate posts is available in the MainWP > Extensions > Boilerplate page, in the Boilerplate Posts tab.
From here, you can Edit and Delete Boilerplate posts.
Source Article:
https://kb.mainwp.com/docs/create-boilerplate-post-2/