Which action is NOT typically associated with customizing a Google Calendar?

Customizing a Google Calendar involves altering its visual aspects and settings to better suit user preferences and needs. Adjusting colors allows users to differentiate between different calendars or types of events, enhancing organization. Changing calendar density affects the visual spacing of events within the calendar view, impacting how busy or clear the calendar appears. Modifying time zones is essential for users who operate across different regions, ensuring events are displayed accurately relative to local time.

On the other hand, setting appointment reminders is generally a feature for managing notifications rather than a customization option for the calendar layout and appearance itself. This action focuses more on enhancing time management and ensuring user awareness of upcoming events rather than how the calendar is presented or customized visually. Therefore, it is not categorized under typical customization actions.