SegmentedButton.SelectionStyle

From Xojo Documentation

aSegmentedButton.SelectionStyle = newSegmentedButton.SelectionStylesValue
or
SegmentedButton.SelectionStylesValue = aSegmentedButton.SelectionStyle

New in 2019r2

Supported for all project types and targets.

The style of selection for the control. The options are Single, Multiple or None. See SelectionStyles for details.