Always know where your shapes are located when working with different layers. With the layer panel visible, all you need to do is click on a shape to see a black dot appear on the layer where the shape is stored. It also works for multiple shapes as long as all shapes selected are located on the same layer.
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Or learn more about diagramming with draw.io at https://drawio-app.com/learning. You can also take a look at our blog (https://drawio-app.com/blog) to always stay up-to-date on new draw.io features in Confluence.