Collapsible headings have been added to ClickUp Docs! Headings of any size can now be collapsed, and collapsing a heading hides the content between the collapsed heading and the next heading of the same or greater size.

More details can be found in our Help Center. Thanks so much for your feedback here!

This is the reason why I am not using ClickUp Dock.

Yes please...this would make Docs much more functional.

this would be really helpful to structure docs and task descriptions

Also see Collapse content with folding as in Coda:

This especially becomes more and more of an issue now that we are integrating our knowledgebase with Clickup.