Let's save this canvas.

Preferably, we want to be able to preserve our layer formats

Ex: .PSD (photoshop), .Sai (paint tool sai)

Turn the opacity down so that you can just barely see it. After you do that, even if you make a mistake with your layers, since the drawing on it is so faint, you'll figure it out quickly.

In real life this would be called "manuscript paper", but here it is the "default border (inner frame)".