How to change the VFD font size of Picture Center FS 8.52

[mysat-bs]

I recently updated my Duo2 to BH 3.0.5I, thanks for the excellent image. I also reinstalled the Picture Center FS 8.52 from the online addon server. However, when I use the Picture Center to show my photos, the VFD screen only displays a few huge letters because the size of font is too big. Would anyone tell me where can I edit the Picture Centre's VFD font size please?

PS: If I am not using the Picture Centre, the VFD font size is prefect for me.