According to the docs, if you append an underscore (_) to the pattern name it should "no longer show up in the drop-down navigation, the media pattern sub-type "view all" page, nor the style guide".
I want to hide a pattern from the drop-down and the 'view all', however I still want to use the pattern as an include, and for the patterns using it to be displayed (as they have no underscore in their file name/parent folder name).
If I try this, the builder will just tell me that the pattern is missing 'Could not find pattern with key atoms-$'.