From FreeCAD Documentation
- Optionally select the layer you want to make active in the Tree view.
- There are several ways to invoke the command:
- Press the button in the Draft Tray. This button can look different. If there is an active layer it will show the name of the layer and a layer icon with the ViewLine Color and ViewShape Color of the layer.
- If you have selected a layer: select the Activate this layer option from the Tree view context menu.
- If you have not yet selected a layer the layer menu opens. Do one of the following:
- Select None to work without an active layer.
- Select an existing layer to make active.
- Select Add new Layer to create a new layer. Selecting this option will not change the active layer.
- If the active layer was changed the button in the Draft Tray is updated.