How do I remove certain options from the menu?

I want to make a simple menu where you can only save and quit, how do I do that?

 

You'd need a script to do so.

Moving to Script Requests

Here's a couple I found:
Mjshi's Non-combat menu
ZS Non-combat menu

 

Code:

class Window_MenuCommand < Window_Command
  #--------------------------------------------------------------------------
  # * Create Command List
  #--------------------------------------------------------------------------
  def make_command_list
    # add_main_commands
    # add_formation_command
    # add_original_commands
    add_save_command
    add_game_end_command
  end # Create Command List
end # end of Window_MenuCommand class

Commenting these three lines does the trick without removing their functionality from the game. The player will be unable to access them from the menu, but you will still be able to access them if you need them for any reason. You can either copy/paste this script or comment them in your own project, you can find them at line 37 of the Window_MenuCommand script.