Hi there and welcome
Can you do the following please
Click a Message in your mail view.
Click HOME (the ribbon should appear)
Then on the far right of the ribbon, is a little drawing pin icon. In this location
That when clicked will turn to the indication above. This pins the ribbon (menu) in place so you can use it
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please