TTMSFNCGridExcelExport.ImageMargin Property
Adds a margin around the cell for images or checkboxes. If you set this to 0 images will go exactly to the edges of the cell.
Syntax
Unit: VCL.TMSFNCGridExcelExport / FMX.TMSFNCGridExcelExport
property TTMSFNCGridExcelExport.ImageMargin: TPoint