How to have non-collapsing text after a header without using a section break

[morrismenage]

Im trying to find out how to have non-collapsing text after a collapsed header with text in it without using a section break and without a line brea. With a section break it looks like this:



Collapsed header
(Section break)
Text not in header

I want it to look like this:
Collapsed header
Text not in header

I have searched everywhere and I don't think it is possible so this is my last hope.

Thank you for the help!