Reference
Configuring Screen Rotation
The screen rotates when you turn your tablet sideways as shown below.

Note
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Depending on the app, the screen may rotate regardless of the direction your tablet is held.
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Some apps may not support screen rotation. Some apps may rotate the screen in reverse.
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Screen rotation is not available when the HDMI adapter cable is attached to your tablet.
Setting the screen to not rotate
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Tap [
Apps & Widgets] - [
Settings] - [Accessibility] - [Auto-rotate screen] in that order to remove the check mark and disable screen rotation.
To set the screen to rotate again
Tap [Auto-rotate screen] again to add a check mark and enable screen rotation.
You can also turn on/off the screen rotation on the control panel displayed from the status bar.
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