procedure SetTextObjectFontSize(Index: Integer; FontSize: Single);
SetTextObjectFontSize writes FontSize into the native text object at Index, changing the rendered size without approximating through a matrix transform
Call UpdatePage afterwards so that the page scene and renderers pick up the change
TransformPageObject; this method only rewrites the font size attributePdf1.SetTextObjectFontSize(ObjIdx, 14);
Pdf1.UpdatePage(1);