When using artboards in Photoshop, your canvas appears white. On a regular PSD, this would be a blank white layer, but on artboards it is a blank transparent slate. Nothing is inside the artboard group. When sharing your PSD via Adobe Extract, you get a big, empty, hard to see canvas.
There are times when displaying the transparent alpha in your comp makes sense, but I find that most of the time, sharing artboards with blocks of transparency looks poor and is hard to work with.
My best practice: place a shape layer as a background. It doesn’t have to be precise, it just needs to cover the entire artboard. Remembering this simple step produces clean comps for your developers to Extract!