Not having menu options always expanded drives me crazy. Here is a reminder for me and for you on how to make menus always expanded in Office.
In an Office application right click on the toolbar area and select “Customize”.
Click the Options tab
Check “Always show full menus”
Click “Close”
I had some problems with the Logitech MX Master 3S Mouse with an M1 MacBook Pro, but I had better luck with a Logitech G502 X Mouse