Asus ProArt Display OLED PA27DCE-K 26.9" 4K HDR Monitor with Color Calibrator - Manual (Page 14)

1-6 Chapter 1: Product Introduction
2. Center Marker
Selects the center marker type.
The selections are:
Type 1 Type 2
Type 3
3. Customization
You can decide the frame size by moving the
Menu (5-way) button up/down/
left/right. You can press the Menu (5-way) button for longer than 3 seconds to
switch the measurements between millimeter and inch.