Future lighting should be enabled on the Roblox lighting technology, if your lighting isn’t working it’s only studio at the moment. You shouldn’t need to head over to the (Beta Feature) option. If you are testing future from, you may have not set your properties correctly. Click the lighting technology and future lighting should be there.
If your still having a hard time enabling it there are examples of seeing where the lighting source is. Check out the release thread and information on it to get a good understanding:
(cc: @Cooler_master12)