EDIT: No sure why but I could get what I want using a device image width and height smaller than my layout, instead of the same value. So if someone knows how to give a layer the scale-to-fit property would be wonderful. Thanks, guys!
Since I’m not sure how big or small the user’s resolution is, I want to give like a pseudo responsive feeling to the prototype, so I’m trying to use the scale-to-fit behavior from a custom device snippet (1920x1080px) to do this, but the problem is that now the prototype don’t use all the space my screen has and never shows like 100% of it, even using a monitor with 2560 x 1440px resolution. Is there a way to use this scale-to-fit like I'm trying to do, perhaps like when you use in css to something to be "width: 100%"? And, is it possible to give a layer the scale-to-fit property?