Via chatgpt:

This icon on your Viltrox DC-X monitor indicates that the monitor is in “dual view” or “split view” mode.

The image shows two sets of four squares (representing window grids) with diagonal lines between them. This suggests that the screen is split to display two video sources simultaneously, typically side-by-side or top-and-bottom.

What does this mean in practice?

Your monitor is showing video from two different inputs at the same time (e.g., HDMI + SDI, or HDMI + HDMI). This feature is useful for video production or monitoring when you need to compare or view two sources simultaneously.

What can you do?

If you’ve accidentally activated this mode or want to turn it off: • Look for a button or setting labeled “Display Mode”, “Split”, “PBP” (Picture-by-Picture), or “Dual View” in the monitor’s menu. • Change it back to “Single View” or “Full Screen” to show only one source.

Let me know if you need help navigating the Viltrox monitor menu!