Window.LiveResize

From Xojo Documentation

Property (As Boolean )
aWindow.LiveResize = newBooleanValue
or
BooleanValue = aWindow.LiveResize

Supported for all project types and targets.

If True, the window is redrawn “live” as it is resized by dragging. The default is True.

Notes

This property no longer has any effect. Windows on all platforms always live resize.