DELETE THE APP!
PROBLEM SOLVED!
Oh bravo on your clever and helpful response!
I am astounded at how 'helpful' so many forum member are!
I cannot speak for the original poster but in my case, it is Apple's very own app store where my on-screen keyboard won't go away. It all started after I had rated/reviewed an app I purchased. Even after several power cycles, it is still there. So now, I can only see 3 apps at a time when in the app store.
Sure, I will go ahead with your advice and delete the Apps store. Great idea!
Clearly, not having a soft or hard option to close the on-screen keyboard is an inherent design flaw!