This will hide some additional features added to the block editor:
- Core Block Patterns: WordPress provides a collection of patterns, but most themes will provide their own patterns and as such the WordPress provided patterns make finding your patterns much harder!
- Block Directory: When inserting blocks, if the user has searched for a block that doesn't exist, WordPress helpfully searches the plugin directory for any plugins that might include that block. Mostly this is not desired behaviour on projects delivered for clients.
- WordPress VIP Featured Plugins: WordPress VIP adds a banner to highlight featured plugins for their platform. Plugins are managed by the developer so this should be hidden.
The editor cleanup is enabled automatically and does not have any configurable options.