I can't see a preview of the fillet I want to create

Hi,

I'm just going through the first parts of the tutorial on the site (rounding edges with the fillet tool) and have noticed that when the guy on the video selects the edges to fillet he gets a nice preview of what will happen when he confirms the fillet... Me on the other hand, I see no preview or change until I confirm the action.

I'm guessing it's just an option somewhere but I couldn't find it when I tried googling and just looking through solidworks settings.

Thanks,

Artur

SolidworksSurfacing