Asus ProArt PA169CDV 15.6" Multi-Touch 4K HDR Portable Monitor & Pen Display - Manual (Page 13)

1-5 ASUS PA169CDV LCD Monitor
2. Center Marker
Select the center marker type.
The selections are:
Type 1 Type 2
Type 3
3. Customization
You can decide the frame size by scrolling the
Dial key up/down. To switch
between the horizontal (width) and vertical (height) setting, press the Dial key. Then
press the Power button to view the frame size and to switch the measurements
between metric and imperial.