I downloaded xcode 10 beta and installed it on my macbook which is running on macOs 10.13.4 High Sierra. I tried to enable dark mode on xcode 10, but i could find how to do
jw382 is a little confused about the Dark Mode, yes you can have a dark Mode, like Midnight, but not the new Xcode 10 beta Dark Mode, where everything is in a dark area. Maybe this other like will help : How do you change Xcode 10 Beta to the new "Darkmode"?
You need to install MoJave 10.14 beta to make you mac Dark Mode first.