On December 2, 2021, Apple has started rolling out the macOS 12.1 developer preview Beta4 update (build number: 21C5045a) to Mac users. This update was two weeks after the last release.
Users can download the description file through the IThome App-Discover-Apple Profile, and download the new version of macOS Monterey Beta through the “Software Update” in the “System Preferences”.
macOS Monterey 12.1 adds the SharePlay simulcast sharing feature. Users who have installed the latest beta version can experience this feature through FaceTime.
In macOS Monterey, Safari has also redesigned a new tab bar and supports tab groups; the “shortcut” application in iOS can also be used on Mac; email privacy protection can hide IP and prevent tracking.