Thank you, Vmassol!
As I understand from the documentation, in the xwiki.properies file we can set macro categories to hide from the list.
In this line:
> # rendering.transformation.macro.hiddenCategories = Development,Internal,Deprecated
This means that I can add a category name to this list for not installed macros and they will disappear from the list in the WYSIWYG selection window, right?
If so, what is the correct name for the category for uninstalled macros? I tried adding “Not installed” there, but it didn’t work.