I have only seen 4 and I believe (not 100% sure though) that my friend's skill menu is full. Unless of course you gain 2 more bars after a certain percentage
Ranger_Vet68, don't be afraid to enter menus, to point your mouse to a different icons... Even if you click on them, nothing horrible is gonna happen in 99.99% of cases...
Hover your mouse over an icon and LOOK AT THE SCREEN! It's ALL there!