How to enable the other Art layers

I was using Harmony last night and trying to change a drawing for a character of mine. It only shows two art layers in the drawing section, line and colour. I however know my character has 4 art layers. Overlay and Underlay are missing. I checked the help section and it said that I had to enable it in the preferences dialogue box. I looked under edit preferences under node and couldn’t find it. So I was wondering if I could get some help. Thanks.

I believe Essentials only has 1 art layer available. both Advanced and Premium have all 4 support. Check under Prefs/Advanced and make sure Support for Overlay and Underlay is checked off. Then just make sure you have your Art Layers visible somplace in your work space. hope that helps!