"To customize the settings" means to adjust or modify the specific preferences or options of a device, software, or system to suit individual needs or preferences. Full definition
You can customize a set of personalized criteria: location, education, age, etc.. (jsoulmate.com)
You can also customize settings for shooting in particular situations, such as the fluorescent lights of the office space you manage. (realtormag.realtor.org)
You can also customize the settings on the camera, including color and brightness, to suit your needs. (digitaltrends.com)