Active Layer: The colours of the layers in the Layers Tool are defined in the Layer Options Settings. To work on a layer then you must make it the Active layer.
To do this,
- Click on the eye icons to show/hide layers.
- The pencil icon in the coloured rectangle indicates that this is the active layer.
- Click the pin icon to fix the layering tool without automatically closing it.
- The height and width of the layer tool can be adjusted when dragging the lower right corner of the Layers Tool.
HotKeys for layer activation:
- T: Top Layer is active
- B: Bottom Layer
- 1: Inner1 Layer
- 2: Inner2 Layer
- 3: Inner3 Layer
- 4: Inner4 Layer
The more information for the PCB layers please refer at PCB Layout - Layer Manager