Hi there.
As title I have been trying to start a new world on the 1.15 unstable and there is no option to start a world after altering the settings.
There is no back button either.
All I can do is select singleplayer to take me back which resets the parameters.
If im missing something please let me know, if it is intended and I diddent see info on the downoad info I appologise.
Loving the game so far, ty Devs