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

[AlwynWong]

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:

Custom Content and Sidebar support

I am attempting to get a hierarchy of custom content showing in the left Sidebar. Blogs and Pages appear to support the ability to show parent child hierarchies in this bar but for custom content (see below)? The sidebar takes up a huge amount of screen space which means that when I view my custom content I do not have room to add my own left navigation structure without compromises. Does the Sidebar support showing custom content hierarchies? Either via an API to control it or implied support…

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