i have updated my ipad 10.5 to iOS 11. When a app is open in full screen and another app is floating, how can i maximize the floating app to use it in fullscreen?
There should be a bar at the top of the floating window. You can use that to maneuver the window as you please: off screen to minimise it for a bit, to the left of the screen and if you pull down on it so it is fixed. Once it's fixed drag the demarcation line to the end of the screen so that it occupies the whole screen.