How do I eliminate split screens on iPad?

Did you read the information in he link that was posted above?

Go to Settings>Home Screen & Dock>Multitasking>Allow Multiple Apps>Off. That will turn off multitasking and prevent the split screen of apps.

See this, Use Multitasking on your iPad - Apple Support

how do I remove split screen

I have split screens on my IPad. How do I get rid of them. I want the one screen

Read the link in the Apple Recommended post.

How do I get rid of a split screen?

I am unable to get rid of split screen,one of which is gmail

Also when I press safari it goes to gmail Have switched the ipad off and on again

Read my response directly above the one that you posted.