property PageWidthZoom[PageNumber: Integer]: Double;
Factor de zoom de solo lectura que ajusta el ancho de la página a la vista
Useful for building a "Fit Width" toolbar button.
All TPdfView display properties trigger a repaint when assigned; you can change several in sequence without flicker because the redraw is coalesced into a single invalidation.
Active := True.PdfView1.Pdf at runtime, re-apply any view-only settings — the new TPdf has its own state.
begin
PdfView1.PageWidthZoom := {value};
PdfView1.Active := True;
end;