Layer Window
The Layer window enables you to define multiple layers for any UModel diagram. Layers allow you to make logical groupings of modeling elements on a diagram. For example, you can create, in addition to the default layer, some extra layers that would store notes with some internal information, or unfinished classes.
![um_layer_window](./images/um_layer_window.png)
Layer window
For more information, see Adding Layers to Diagrams.