how do I get rid of a split e-mail screen and back to a full e-mail screen to read mail?

cannot open the reply icon. help

This is ridiculous!!  I have NO idea how my screen got to this split-screen email and I want it back to normal...right now!  Now, not just the email is affected...I have the internet in the left half, and my email on the right!  (I am in “landscape” mode—also known as rotating it horizontally....long way left to right...not top to bottom!)

Here’s a screen shot.  I’m using icloud email on my iPad...and Google Chrome to browse the Net.

HELP!!

screen shot:

How do I restore screen back to a full screen to read my e-mails??  It is now a screen split in half!  Also when sending an outgoing e-mail it notifies me "error, pop 3"   & tells me e-mails "not sent."      What does that mean????   Pleeeeazzzzzzze help!!!!??

About a month ago, the layout of my Outlook email screen was changed without my request and the screen was split into three: inbox, message and ad at the right hand side.  This is now a clumsy and confusing way for me to access, read and write emails.  How can I have it changed back?

I don't understand how "did this solve your problem" as the the problem only is displayed and a solution is offered or a reference to previous reply/s that detail a solution.  Someone in application approval has a corrupt logic.  Maybe this post is only directed to the Problems Section and not the Solutions Department ?

The screen is split down the middle—my email is on the right side and Google Chrome is on the left.  Everything worked perfectly...I just couldn’t get a full screen when browsing!  Or...looking at my mail, too!!  This isn’t about ‘panels’ in the email...it’s about 2 apps on one screen!!  Fortunately, I fixed mine!!  I finally noticed a ‘handle’ or a small silver thing, in the small space separating the two halves of the screen—it looked like a ‘slider’—something you would tap & slide up & down.  I began screwing around with it and Eureka! It went back to normal again!!  So...maybe someone can look into that...I have no idea what I accidentally did in the first place to get it split.  But I’m glad it’s fixed now!!

Thanks for your interest in helping me with this issue!  —Jude—