KeepShowElements works with Action.ShowElements so that items that have been shown or hidden by the user remain that way when the report is re-displayed or exported.
Set KeepShowElements to True for report exports so that those elements that were originally hidden but then shown by the user with an Action.ShowElement get included in the export. Alternatively, any elements hidden by the user will not be exported.
KeepShowElements also works from Process definitions so that if the user is returned to the original calling report, the same elements remain visible.
The default value for KeepShowElements is False.