Suddenly had text and email attachments open in a slide screen only one third of screen size instead of full screen

I have the same problem and would like a solution, if it exists, to the question posed in the OP. How do I get my links to open in my full screen Safari window like it used to before Slide Over? Is there a setting that can be changed to accomplish this or can Slide Over be disabled?

TIA, Elizabeth

Grab the bar at the top and slide it toward the edge till you see a side by side view. Once you see that release and it will show side by side. From there, slide the bar in the middle of the screen to a side so that window becomes the full size app. This will restore it to full screen. Otherwise you can go to the app switcher screen by double pressing the home button if you have one, or slide your finger from the bottom up toward the middle and hold it till you see all the open apps. Slide them off the screen or just slide the one that shows the small email window show and slide it off the screen to close it. Then open back to the email app and it should be full screen again.