Using Documents - containing a lot of headings - the problem exits, that inserting cross-references "headings" in the field "display" the search of the heading is inconvenient.
IMHO it is a relief when the presentation in the "display" can be opened or closed as the Navigator.
Thanks for your report for this enhancement.
So to be specific: the content of the list with headings must have the possibility to fold/unfold on each top level header. What is called tree-view (iirc)
I set this to new.
Starting in 5.2 there is a search/selection field on top of the list with headings.
So I think that helps you a lot..
It is build for bug 32364
See also here https://wiki.documentfoundation.org/ReleaseNotes/5.2#Selection_Filter_in_Cross_Reference_Tab
Therefore I think/hope it's fair to close this issue. If you don't agree, please feel free to reopen.
Ciao - Cor
*** This bug has been marked as a duplicate of bug 32364 ***