Hello ToniGann,
Thank you for using Apple Support Communities!
We understand from your post that when you turn your iPhone horizontal to play a game or watch a video the widgets cover part of the screen. Restarting your iPhone and then reinstalling the software may help to remove the widgets from covering your other apps content.
Restart your iPhone - Apple Support
The following article has the steps on how to backup your iPhone before you reinstall the software:
How to back up your iPhone, iPad, and iPod touch - Apple Support
By using the steps as listed under the heading "Put your device in recovery mode and set it up again" from the following article you can reinstall the software on your iPhone:
If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support
Best Regards.