You wrote in your previous question, that you used the extra/snippet “navigator” for this.
I don’t know this extra/snippet and can’t find any reference to it. Is there maybe a (Github) page with the code somewhere?
Usually snippets of this kind still work correctly in MODX 3 (when they worked in MODX 2.x). So if you still have the code/transport-package somewhere, it might work when you use it in MODX 3.