DesktopDisplay.Left

From Xojo Documentation

Read-Only Property (As Integer )
IntegerValue = aDesktopDisplay.Left

New in 2021r3

Supported for all project types and targets.

The left coordinate of the screen relative to the main display. For the main display, it is zero. Use the DesktopDisplay.DisplayAt method to call Left. For example, DesktopDisplay.DisplayAt(0).Left returns the left coordinate of the main display.