If you install a macOS update that breaks an essential app,
you can restore your Mac from a snapshot taken just before
the update was installed. First of all, restart your Mac and
when you hear the tone, hold CMD-R to boot into Recovery
Mode. After logging in with your administrator’s account,
choose to Restore from Time Machine Backup, even if you
don’t use Time Machine. You can then restore from a local
snapshot, taking your Mac back to a point prior to the update.In macOS Catalina, the system runs on a dedicated system
volume, which is read-only. This keeps it separate from all
your other data and makes it impossible for you to overwrite
a critical system file accidentally.If your Mac and Apple Watch meet the
system requirements, you can double-click
on your watch’s side button to open locked
notes, view passwords in Safari preferences,
and more. You can also approve app
installations with your watch, and even
modify root files. Your watch does the
authentication instead of your password.When playing a video in QuickTime Player,
hover the pointer over the video to reveal
the Control panel. Click the icon on its right-
hand side to have the video appear in a
floating window, which is always on top of
other windows.
Click CMD-I or use the Window pull-down
menu to open the Movie Inspector. This
has been enhanced and now shows more
in-depth information about the open file,
such as video colour space, HDR format,
aspect ratio and more.Your Mac’s desktop often fills with files and folders,
Stacks, first, click on the desktop to make sure Finder is
Use Stacks. Your files are stacked on the right-hand
Click on a stack to access and open individual files.The first time you open an
If it’s from an unidentified
Desktop
Stacks
Restore from
Snapshot
Read-only
System Volume
Apple ID Pane
Opening Apps from Unidentified Developers
Media Syncing
Approve
with Apple
Watch
QuickTime Player Enhancements
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