To find which layer a component belongs to in the Power Platform, open the component and select it, then go to See solution layers:

We see the order of each later, starting with the System layer at number 1. Then each solution has a layer number, and at the top we have the active layer, in this case at number 18:

For more information on layering of solutions, see this post on Patching of Solutions in the Microsoft Power Platform.

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