In the left column, under "Store Designs," the Designer will populate all artwork that is available in your store for that item.
In our example, we are customizing a t-shirt, which doesn't allow embroidery. For that reason, all embroidery designs are hidden for this item.
Once you find your desired design, click or tap the design. A popup will ask if you want to "Select Design" or cancel.
"Select Design" to drop this artwork on your garment.