You pin the entries you want to see in your outliner and their header.

I have some technical restriction for example: if you pin the header entry but no of the "childs" there is no entry in the outliner. The native outliner show in this case every child. That's currently not possible to implement.

Please make a tutorial or show how to pin these out liners this does not work for me

I think that with your efforts, I can even achieve 3-4 rows of outliner at 3440x1440 resolution.

My self-made UI Collection has copied your framework and worked well (after more than ten hours of efforts, every module can work). You really don't look like a modder who just started making mod. Thank you for your work and hope to continue to learn from you.