efaq: Using Customize
5.2 How do I start using Customize?
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The main Customize entry point is ‘M-x customize <RET>’. This command
takes you to a buffer listing all the available Customize groups. From
there, you can access all customizable options and faces, change their
values, and save your changes to your init file. (emacs)Easy
Customization.
If you know the name of the group in advance (e.g., “shell”), use
‘M-x customize-group <RET>’.
If you wish to customize a single option, use ‘M-x customize-option
<RET>’. This command prompts you for the name of the option to
customize, with completion.