Asus Fonepad Note 6 - Manual (Page 40)

ASUS Fonepad E-Manual 0
Locking the screen orientation
By default, your ASUS Fonepad screen automatically changes its orientation from
portrait mode to landscape mode or vice-versa, depending on the way you hold
your device.
You can disable the auto-rotate screen function by following these steps:
1. Tap on the Home Screen to open All Apps screen.
2. Tap
Settings
> Accessibility then tap Auto-rotate screen to deselect.
NOTE: You can also enable or disable this function from the ASUS Quick Settings.
Refer to section Settings for more details.