In order to film horizontally, you must make sure Auto Rotate is on!
The auto-rotate button automatically rotates your device's screen when you flip your device between landscape and portrait mode.
Let's learn how to enable and disable auto-rotate or orientation lock on an Android device.
Method 1
Open the notification bar by sliding down from the top of your screen
Find "Auto-rotate", "Auto-rotation", or "Orientation Lock" (depending on your device) in the Quick Settings menu
Tap on the icon to enable or disable the feature
Method 2
1. Go to settings
2. Select "Display"
3. Scroll down until you reach "System" and select to turn on Auto-Rotate
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