Is there a way to install a new desktop environment with all the settings and presets it would have if I installed it with Cnchi?
Install new DE with Antergos presets?
It depends on which DE you want to install. Using Pamac (or Octopi) it the easiest way. Type Antergos in the search box. It will show you a list of Antergos preset DEs. (Why there is no default tab in Groups by now is beyond me) If the DE of your choice is not in the list, just go to groups and select the DE and all its dependencies you want to install.