Microsoft has made a few changes to the Calendar in Windows 11, one of these changes is removing events integration in the calendar flyout from the taskbar.
However, you may need to sign in to your Microsoft account to synchronize the calendar across your devices.
The Calendar app works offline, so you don’t have to connect to the internet every time you want to check your schedule or agenda. Windows Calenders also allows you to synchronize with your accounts like Google calendar, Outlook, iCloud, etc., and view various calendars at the same time in one place. Windows 11 comes with its own built-in calendar app that helps you schedule tasks, meetings, reminders, appointments, and other events from your personal agenda.