Here's how to make your Fast Dial logos appear bigger on hover.

First, select Options:

Then Appearance > Thumbnails:

Select the number shown before in the margin settings, or choose your own - play about with them, but make sure the left one is bigger than the right: (Your other settings don't have to be like mine - they can be whatever you like)

Hit close and you should be done this is what the finished result should look like, inactive and then on hover:

Hope this helps!

macleod.mac