hmmm, :-) I'm not sure how you have yours setup, but maybe this helps a bit more. If by "preview pane" you mean the "Reading Pane" which shows you the email message content, then see my image below where my "Reading Pane" is setup to show to the right of my Inbox list of messages (you may have yours setup differently, such as you might have your messages at the top and the "Reading Pane" set to show below them at the bottom of the screen.) My daily Agenda view does not cover up all of the "Reading Pane" but only a portion of it. The Agenda view will show all the time that the toggle is enabled to the right of the "Reading Pane", and when clicked again the Agenda view disappears and your "Reading Pane" is enlarged (on/off switch). So, if you feel that you don't have enough area to read your message you can just toggle it off for a bit and then back on as needed. I'm not a Microsoft Support person, just trying to help. Hope this is helpful.
