How can I remove left hand column in mail?

Not anymore.

But you could try this iOS email client, instead.

Instead of waiting out Apple and the iOS software team to straighten out all of the issues with the iOS 10 Mail app, which I think WON'T happen anytime soon, if want to bring back all of the previous goodness about iOS Mail and get a few more bells and whistles, in the process.

If you are a Google Mail, Yahoo Mail or Microsoft Hotmail user, here is a almost exact replacement for iOS Mail that adds back all of the missing functionalities in iOS 10 Mail app and adds even more.

The most recent update adds a few more email services, so read the update details!

One user has successfully gotten this to work with their AOL account, if anyone is still using AOL.

Look at this nearly exact email app replacement for the previous version of iOS Mail.

I really like this email app a WHOLE LOT better than the stock Apple iOS Mail App while still looking very much like the standard iOS Mail App.

This is a real beautiful email app to use and, if you are a large iPad Pro user, then this email app's UI really shines!

This app only works with listed compatible services with IMAP accounts only!

Email

Email - mail for Gmail Yahoo iCloud & Hotmail by Easilydo Inc.

https://appsto.re/us/wAla3.i

One of the real nice things about this app as it has a setting to allow the Safari web browser to open right up inside of this mail app.

Which is super convenient and quick!

If anyone can use this iOS Mail app replacement.

You're Welcome!

iOS Mail app on my iPad Pro, running iOS 10.3.2. has no double arrows over the email to go full screen email, no delete all and no email scrolling arrows in landscape orientation, which is how I always use my iPads.

Hence, why I switched iOS email client app since iOS 10 came out.

Hi lewinfromhaverford. You could also rotate the device to portrait format.

Do you see a diagonal double arrow above the email? Tap that and the list on the left will be hidden.