On an iPhone or iPad, you can turn off AirPlay from the app you're streaming by tapping the AirPlay icon and selecting "Turn off AirPlay." ...
You can screen mirror content from your iPhone to your Samsung TV using AirPlay or a wired connection.
The easiest way to rotate your iPhone or iPad screen is by physically tilting the device. As long as the Orientation Lock toggle isn't turned on, you can easily switch between Portrait and Landscape ...