right here in Scene_Title
@command_window = Window_Command.new(192, [s1, s2, s3])
@command_window.back_opacity = 160
@command_window.x = 320 - @command_window.width / 2
@command_window.y = 288
Setup:
@command_window = Window_Command.new(<length>, <width(here measured by the number of commands)
Then window opacity, and its location on the x and y coordinates