If you have enabled Friendlists

The display showing in the MyFriends section of your profile page will be different  for everyone who comes to your profile page.  Each visitor will only see your friends who happen to be on the same friendlist that they are on.

For example, say you have a friendlist called Family.  In that list you have your mom, dad, brother, and sister.

Because they are all on your family friendlist, when they come to your profile, they will only see Mom, Dad, Brother, and Sister in your MyFriends section.

Other friends will see something different when they come to your profile page.  If you have added a bunch of co-workers to a co-workers friendlist, when they go to your profile, they will see co-workers, but none of your family memebers. 

If you just want to control how many friends show or in what order they show in the MyFriends section of your profile

Currently, this canot be done.  This will be added in the future.