Your character is the same on every world. Resources, chat and other players are per world.
Auto starts from your device and steps down if the frame rate drops.
Close sits low behind your shoulder. Zoom and drag still work in both.
Moody is darker and earthier; Classic is the original bright look. Switching reloads the game.
60 is plenty for this game and keeps your graphics card cool. Use 30 on laptops or battery.