SSRS - unchanging font size of link fields

Hi everybody,

I have added fields in my report like Shipment's ID or PickingRouteId. When printing the report, they are displayed blue, linked to the corresponding Shipment or PickingRoute.

Blue is not the problem but I can't change the font size. Whatever I set in the TextBox properties, it is displayed the same.

I noticed I am not the same with this problem but I didn't find a solution.

Thanks for helping me.

Guillaume