Turning off iCloud calendars means that calendar appointments are not synced between devices through iCloud, however, it also means that advanced features become enabled in the Calendar app. You may have one or more calendars stored on your Mac. If you don't want to use iCloud to store calendars, clear that checkbox. Notice that iCloud calendars disappear they are not deleted, just not shown, and that the title in the sidebar says On My Mac. Related: Calculate appointment travel times with Calendar Local calendars on the Mac Related: Speak Calendar appointments instead of typing them Let's see what the are and why they are removed. Yes it syncs, but it removes a couple of great features that you might find very useful. There are disadvantages of using iCloud calendars and one is the reduced functionality of the Calendar app on the Mac. You can make an appointment on any device and see it and be notified everywhere. This is excellent and it is just what most people want. The advantage is that any Mac, iPhone or iPad can access the calendar and so you will see appointments on every computer and device. This is probably the default for most people and the Calendar app uses iCloud to store your calendar appointments online. There are pros and cons of each type of calendar. The Calendar app on the Apple Mac can be used to access calendars on iCloud or stored locally on the disk.

How do i open calendar on mac desktop