We thought about how to make Live Preview better, and then we went ahead and did the things we thought of. There's a Pro Tip™ in there somewhere.
Live Preview now feels smoother than ever and now sports the ability to preview different device widths in real time. Were I to use 10x more words to explain it you wouldn't gain any additional knowledge, so instead here's a video of it in action.
And yes, the device names and corresponding dimensions will be configurable. 🔥 Have a great weekend!