Yep. Unless you don't want to include some parts in the list, they have to be visible. The same applies for components that are assigned to layers which are turned off. This is a great way to control the contents of the cut list.
I started using cutlist for sketchup 6 weeks ago. it took a bit of time to learn and optimise but so far I am very happy with the results.
Next week, we start fitting our first project designed and made with the help sketchup , layout and cutlist.
Ill let you know how it goes.