Final answer:
Admins can customize the look and feel of an instance using a theme manager or appearance settings module, which allows changes to design elements like colors, fonts, and layouts.
Step-by-step explanation:
The module that allows an admin to change the look and feel for an instance is typically known as a theme manager or appearance settings module within a content management system (CMS) or web platform. Admins can use this module to customize design aspects like colors, fonts, layouts, and sometimes more advanced features like CSS styles or templates. This is critical for ensuring that the instance aligns with the branding and design preferences of an organization or individual.