Hi @eventermom,
I only saw your reply in this thread now (I had only seen the one that you opened), and I’ll be happy to answer here as well, of course!
That is (unfortunately) correct. While I would love to support these features for tables with merged cells, the frontend table features require a table without merged cells, as those are not compatible with the JavaScript code, for technical reasons. You would therefore indeed not be able to use the Horizontal Scrolling feature with that table.
The Responsive Tables feature module?does however contain a different implementation of horizontal scrolling, which also works with tables that do have merged cells, as that does not rely on JavaScript code.
I hope this helps!
Best wishes,
Tobias