Does anyone have a script to create a "Related Topics dialog" that was in 2019, and is not in 2022

In the New UI, you can add multiple topics from a single folder by Ctrl+clicking on the required topics, in case that helps a little. Unfortunately this doesn't seem to work when you search, so you can only add topics one at a time using the search feature.

I would suggest submitting a feature request both to add the "All folders" option and to allow multi-select when searching in the Add Related Topic dialog box.

You can request features and report issues here: https://tracker.adobe.com/
Post the item number in the discussion so people can easily vote if they want the same functionality.

What you're looking for is probably more than a script but a hand-built UI that works as a kind of stand-alone add-on to RH.

This is definitely possible but any programmer would need to know the exact HTM structure of RH 2019 and what you want it to look like in 2022.

I've not seen anyone post about having created such a script and I understand the scrpting is now less well documented.

For what it is worth, it appears that others have accepted the change. Sorry I can't help.

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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.

An exact replacement for this part of the original dialog, with same functionality

something like this. plus reorder topics, delete, set topic label that will appear in the popup menu