Is it possible to declare custom content but not have it on the sidebar as an option?

Is it possible to declare custom content and have it not show up in the app sidebar or be disabled by default?

https://developer.atlassian.com/cloud/confluence/modules/custom-content/

Custom Content UI Support seems to be a required property and when declared it appears to show up on the sidebar.

Here is a similar question but not answered:

The real problem is we want to define more than more custom items but not have them all displayed on the sidebar.