I prefer setting up a template layer for that purpose, because then I can trigger Outline view using the keyboard shortcut. But in this case I needed to see the preview with the sketch. This has just happened to me in my work, it's not just a theoretical example.
Tip: Ctrl + clicking the visibility icon (eye) on the layers panel will change to outline view of the specific layer.
I prefer setting up a template layer for that purpose, because then I can trigger Outline view using the keyboard shortcut. But in this case I needed to see the preview with the sketch. This has just happened to me in my work, it's not just a theoretical example.