Right now if you add more than one site it gets cut, making the bar longer wouldn't solve the problem, furthermore at the moment there is no way to remove one site without having to look through the bar and remove it by selecting and deleting.

I think the style of adblock plus is way better as it shows a lst of exceptions and allows to delete them with a click:

https://s31.postimg.org/74ywpmdrv/dec.png