Hi Pilou, you'll be able to have any number at the same time, 7 is just the default initial number of styles.

If you add more, the style picker will expand to include them, like this (here I just repeated those 7 some extra times but you can get the idea of the size expansion):



But currently the purpose of styles is not so much about coloring your objects for artistic purposes - the focus right now is more about organizing your model into a few different categories.

In the future that may change when there are more properties available for the visual appearance of your objects, I'll probably try to expand the initial default set of styles at that time. That will be some time after v2 though.

- Michael