No, no zoom or format button.

In the menu option there is a Picture Adjustment option which allows
4:3 or 16:9, but the picture appears 'zoomed'. I have a Sony WEGA tv
at home that has a zoom function, and the effect is exactly as if I've
zoomed the pic at home.

I wonder whether it's a configuration option (or whether I should find
a feature that allows me to restore factory settings??)