Disable specific blog post templates
If you don't want your users to use specific page templates as blog post templates, you can disable them in the following configuration.
To disable the app in specific spaces, use this documentation: Disable the app in specific spaces
Global Configuration
In the global configuration, you can hide templates for blogs by selecting “Hide in create dialog”.
Space Configuration
In the space administration, you can disable certain templates just for the specific space by selecting “Hide in create dialog”.