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I can't find much information as to what the "Active" layer is within the Solution Layers functionality.
I can see components with an Active layer at the top and others without it. Does the Active layer only appear if an unmanaged customization has been made to a managed component? If so, what would be considered an unmanaged customization in this context.
You are right - the active layer is the unmanaged solution layer.
Components can appear on the unmanaged layer if they have been edited in the default solution (Settings - Customizations - Customize the System actually opens the default solution)
If you edit there any managed components (then a new layer unmanaged or Active will be added on top ) containing your unmanaged customizations or if you create a new entity then this will be added to the Active Layer (Unamanged) by default.
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