Shared Styles

Shared Styles already existed in Sketch 2, but they have been given a significant overhaul in version 3. Shared Styles are now located in the the white box between the general layer options an the style options.

You can create a new style by selecting a shape and creating a new style from the drop-down menu there. You can create as many styles as you want and you can switch between existing styles using this panel as well.

A change you make to one Shared Style is immediately reflected on all the others.

Note that they work effectively the same now as Text Styles and Symbols. The same sorting and editing options apply as there.