FMXGrid overall font size

What is the simplest way to set the font size for the entire grid ?
This includes the fixed rows too.

I'm struggling with styles and can't quite find where the base grid font would be.


Each grid cell implements a Layout property that can be accessed in the OnGetCellLayout event:

The Layout contains properties for the visual appearance of a cell.

procedure TForm1.TMSFMXGrid1GetCellLayout(Sender: TObject; ACol,
  ARow: Integer; ALayout: TTMSFMXGridCellLayout; ACellState: TCellState);
begin
  ALayout.Font.Size := 20;
end;

Kind Regards, 
Scheldeman Pieter