Active Layer
To set a layer as the active layer:
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Right-click on the name of a layer under the Layers node in the Design Data pane and select Set As Active Layer to make that layer the one you want to interact with.
                                                 
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The layer you selected is shown as the active layer in the Active Layer drop-down:
                                                You can use the Active Layer drop-down to select a different layer as the active layer.
Note: The list of layers in the drop-down will only show layers that have been loaded from the Design Window.