Not at the moment it's not. She can change the banner back to large by going to the Instant Site Layout page. This will remove the spacer block. If it a customer banner she has uploaded the this should work fine as the software automatically save a small and large version of the image.

Mrs digi changed her menu instead of a horizontal menu she changed it to a vertical menu - she kept her small banner image but the software then put in a spacer block is it poss to make this spacer block into a logo?or an image logo?

Digi

PS she would post this her self but she is busy uploading photos to her site