How to close extra AOL mail boxes on IPad Pro 3rd generation

I also had the issue with extra AOL mail boxes open and have found a way. With the mail application open, you should see 2 overlapping squares at the bottom right of the screen. Tap on these squares and it will open to show you all the open AOL mail windows. One at a time, swipe up on the left side and it will show you the open window. You should see three dotes on the top, center of the window (…). Tap on the 3 dots and choose close. This worked great for me. I hope it helps others.