Open your calendar application or service. This could be Microsoft Outlook, Google Calendar, Apple Calendar, or any other calendar software you are using.
Locate the shared calendar from your colleague.
Right-click or tap on the shared calendar that you want to stop receiving notifications from. Look for options such as "Unsubscribe," "Remove," or "Hide notifications." The specific wording may vary depending on the calendar application you're using.
Select the option that will stop notifications from the shared calendar. This action should remove the calendar from your list of active calendars or disable notifications specifically for that calendar.
Confirm your choice if prompted to do so.