[aceuk]

I have a few comic books and I want it so that when the book is highlighted it so the cover pic only.
Not as in the above image where it displays 4 random images
Folders go like this
Green Goblin
Green Goblin 001
Green Goblin 002
Green Goblin 003 (includes Book File Green Goblin 003 and pics of cover Green Goblin 003-folder.jpg and Green Goblin 003-thumb.jpg) I was hoping the -thumb.jpg would replace them but it does'nt.
How can this be corrected