Page Spread has takdn over my screen and the cursor has disappeared

I really don't know what or how l have done this, but the screen suddenly switched to the double page spread taking over my whole screen, with no 'x' anywhere to downsize it and my cursor has disappeared.
My tablet is a touch screen so I have tried using two fingers to shrink the screen but all it did was shrink the page size?
I am suddenly stuck!
And have tried lots of things to get out of it but I had done some work on the document before this suddenly happened and don't want to close my laptop down and lose it all!
