ILegend.HorizMargin
ILegend

property HorizMargin: Integer;

Type Library
TeeChartx

Description
Default Value: 0

The HorizMargin property speficies the number of screen pixels between Legend and Chart rectangles. By default its 0, meaning Legend will calculate a predefined margin based on total Legend width.

It's only used when Legend position is Left or Right aligned otherwise use Verticalmargin.