I have 2 Windows 10 PCs with Outlook 2016 installed. When looking at an email in the preview pane, I have different locations for the reply/forward/etc buttons. One has it at the top, the other one on the right:
There is a similar issue is when looking at the calendar. On the version where the email buttons are on the right, the calendar shows the different day/week/month view modes in a menu on the right. On the other version, those buttons are missing.
Where is the setting that lets me chose between the one or the other? I generally prefer the top menu and the missing buttons on the calendar.