Turn iCloud features on or off
You can change which iCloud features you are using on any of your devices by turning features on or off.
You can also sign out of iCloud completely. See the Apple Support article Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV or Mac.
Turn iCloud features on or off on an iOS or iPadOS device
On your iOS or iPadOS device, go to Settings > [your name] > iCloud.
Turn iCloud features on or off.
Turn iCloud features on or off on a Mac
On your Mac, choose Apple menu > System Preferences, then do one of the following:
macOS Catalina 10.15 or later: Click Apple ID, click iCloud, then select or deselect each feature.
macOS 10.14 or earlier: Click iCloud, then select or deselect each feature.
Turn iCloud features on or off on a Windows computer
On your Windows computer, open the iCloud for Windows app.
Select or deselect each feature, then click Apply.
Some features are not available on your Windows computer, or are listed differently, depending on whether your computer has Microsoft Outlook 2016 or earlier installed.
With Outlook: You can use iCloud Mail, Contacts, Calendar and Tasks in Outlook. Note that iCloud reminders are called tasks in Outlook.
Without Outlook: You can use iCloud Mail, Contacts, Calendar and Reminders in your web browser on iCloud.com.
If you select Bookmarks, and your computer has Google Chrome or Mozilla Firefox installed, you can click Options to select the Windows browsers whose bookmarks you want to keep up to date with bookmarks in Safari on your iOS devices and Mac computers set up for iCloud Safari. For information about browsers supported by iCloud for Windows, see the Apple Support article System requirements for iCloud.
When you turn off an iCloud feature on a device, information stored only in iCloud for that feature is no longer available on the device. For example, if you turn off iCloud Photos on your iPhone and iCloud Photos contains photos from your Mac, you can no longer access those photos on your iPhone. If you turn off a feature on just one device, you can still view and change your information on iCloud.com and on other devices where that feature is turned on.
In some cases, when you turn off an iCloud feature on a device, you can keep a copy of the feature’s information on that device, but the copied information is not kept up to date with iCloud. If you turn off the Mail, Contacts, Calendars and Tasks setting in iCloud for Windows on a Windows computer, information stored in iCloud remains available in Microsoft Outlook, but it is not kept up to date with your other devices.
Before turning off a particular feature on all your devices, or before turning off iCloud completely, you can archive a copy of your iCloud data on your computer. See the Apple Support article Archive or make copies of the information you store in iCloud.