I found a possible workaround.
Let's say you've designed your game in 720p. You have all your layouts set to that resolution too
height 1280px
width 720px
So then go to your project and cut that resolution in half (640x360).
Now add browser event > set lay out scale to "0.5". Bang, now your layouts are scaled down to fit the new smaller "screen". Easy to implement easy to reverse.