The hideBorderFor100PctHeight property (boolean) hides the border of the Gantt chart component in heightSpec = "Parent100Pct" and heightSpec = "Max100Pct" modes. The border width is forcibly set to 0 using an inline style (it overrides the CSS theme).
Available since version 2021.3.5085.
false
dp.hideBorderFor100PctHeight = true;