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