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macOS Catalina 10.15.4 introduces iCloud Drive folder sharing, Screen Time communications limits, Apple Music time-synced lyrics view, and more. The update also improves the stability, reliability, and security of your Mac.
Finder
- iCloud Drive folder sharing from Finder
- Controls to limit access only to people you explicitly invite, or to grant access to anyone with the folder link
- Permissions to choose who can make changes and upload files and who can only view and download files
Screen Time
- Communication limits for controlling who your children can communicate with and be contacted by throughout the day and during downtime
- Playback control of music videos for your children
Music
- Time-synced lyrics view for Apple Music, including the ability to jump to your favorite part of a song by clicking a line in lyrics view
Safari
- Option to import Chrome passwords into your iCloud Keychain for easy AutoFill of your passwords in Safari and across all your devices
- Controls for duplicating a tab and for closing all tabs to the right of the current tab
- HDR playback support on compatible computers for Netflix content
App Store with Apple Arcade
- Universal Purchase support enables the use of a singular purchase of a participating app across iPhone, iPod touch, iPad, Mac, and Apple TV
- Recently played Arcade games appear in the Arcade tab so you can continue playing on iPhone, iPod touch, iPad, Mac, and Apple TV
Pro Display XDR
- Customized reference modes that you can tailor to specific workflow needs by selecting from several color gamut, white point, luminance, and transfer function options
Accessibility
- Head pointer preference for moving a cursor on the screen based on the precise movements of your head
This update also includes bug fixes and other improvements.
- High Dynamic Range output to HDR10-compatible third-party displays and TVs connected with DisplayPort or HDMI.
(Note on HDR: Some users reporting problems with HDR on some displays. Turn HDR OFF in System Preferences-> Displays if you see problems. IMHO, HDR mode should be not be "always on" - it should only be enabled by HDR content, like HDR TVs do.)
- OAuth authentication support with Outlook.com accounts for improved security.
- CalDav migration support when upgrading to iCloud reminders on a secondary device.
- Resolves issue where text copied between apps may appear invisible when Dark Mode is active.
- Fixes an issue in Safari where a CAPTCHA tile may display incorrectly.
- Resolves an issue where Reminders may send notifications for completed reminders.
- Fixes an issue with screen brightness for the LG UltraFine 5K display after waking from sleep.
Some features may not be available for all regions, or on all Apple devices. For more detailed information about this update, please visit: https://support.apple.com/kb/HT210642"
macOS 10.15.4 also includes 
