Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
The only suitable resolution which I found is to install Microsoft 2019 over the existing installation. That done the ridiculously overszed menu bar items and the tool bar items have been greatly reduced.
I would image that reverting to Microsoft Office 2016 would achieve the same result, but with the loss of any functionality that was added to 2019.
I wish MS would at least test products before they venture into making changes that probablly were't wanted or needed anyway. Come on MS... put out beta releases to find the problems before everyone has to go through trying to resolve a problem that shouldn't even exist. "Improvements" are not always improvements and they can cost users hours and hours of valuable time trying to find an answer.
If it aiin't broke, don't fix it.