Why isn't this working for me?

It would be helpful to check if all the prerequisites are met and ensure there are no hidden configuration issues or errors. You could also try troubleshooting with logs or reaching out for further assistance.

What exactly do you want to achieve? I can see several layers in the layer panel. Your artwork is on the “Drawing” layer in your third screen shot. If you want to go by the naming in the tutoiral you could double click the name “Layer 3” to rename it to “Background”. Then you would have to add a rectangle to that layer which is present in the first screenshot. This rectangle will be on top of everything.