The split screen when opening emails or creating a new email is to small
Get rid of the split screen. It's a horrible design.

First off, Thank you for taking the time to provide feedback. We truly do value it!
I just wanted to follow-up with you. Are you referring to the reading pane? If you are not a fan of that, you can disable it by doing the following
1) Click on the Gear in the top right.
2) Look for the Reading Pane section. Then select Off.
Once this is off, it will give you a larger view of your mail which you can click in and out of.
Hope this Helps!
David Los