Hi Leon and Sherry
I experienced the "text autofit improvements" issue as well with my Storyline 3 after installing the Build 3.16.27367.0 update.
I needed a temporary solution urgently as I had several projects in hand to complete, therefore, I uninstalled Storyline 3 and reinstalled an old .exe installer (Storyline 3, 20 Dec 2021 version), which I had a copy of. If you have a copy of an older version of the .exe installer by any chance, you can try to do the same - deactivate > uninstall > install the older version > reactivate, and see if this works for you too.
The older version is more stable in this case. If the latest update is not urgent for any of us, I think it may be best to wait a while longer for it to be more stable before updating our Storyline 3. Let's give Articulate more time to do more bug fixes if required.
Hope this helps!