Shift It offers support for basic actions, such as aligning the window to any of the desktop margins, placing it in the center, toggling the full screen or zoom modes, and so on. Moreover, you can increase or decrease the window size, or navigate to the next screen. Effortlessly define your own keyboard combinations for rearranging windows.
- Use Night Shift on your Mac Night Shift automatically shifts the colors of your display to the warmer end of the color spectrum after dark. Studies have shown that exposure to bright blue light in the evening can affect your circadian rhythms and make it harder to fall asleep.
- On the laptop keyboard, press and hold Control-Option-Shift (your Mac might turn on). Hold these keys for 7 seconds, then press and hold the power button. If your Mac is on, it will turn off while.
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These key combinations apply only to Mac computers with an Intel processor.
To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. Keep holding until the described behavior occurs.
- Command (⌘)-R: Start up from the built-in macOS Recovery system. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. If your Mac is using a firmware password, you're prompted to enter the password.
- Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. If your Mac is using a firmware password, you're prompted to enter the password.
- Option-Command-P-R:Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery.
- Shift (⇧): Start up in safe mode. Disabled when using a firmware password.
- D: Start up to the Apple Diagnostics utility. Or use Option-Dto start up to this utility over the Internet. Disabled when using a firmware password.
- N: Start up from a NetBoot server, if your Mac supports network startup volumes. To use the default boot image on the server, hold down Option-N instead. Disabled when using a firmware password.
- Command-S: Start up in single-user mode. Disabled in macOS Mojave or later, or when using a firmware password.
- T: Start up in target disk mode. Disabled when using a firmware password.
- Command-V: Start up in verbose mode. Disabled when using a firmware password.
- Eject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc. Disabled when using a firmware password.
If a key combination doesn't work
If a key combination doesn't work at startup, one of these these solutions might help:
- Press and hold all keys in the combination together, not one at a time.
- Shut down your Mac. Then press the power button to turn on your Mac. Then press and hold the keys as your Mac starts up.
- Wait a few seconds before pressing the keys, to give your Mac more time to recognize the keyboard as it starts up. Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognized and ready for use.
- If you're using a wireless keyboard, plug it into your Mac, if possible. Or use your built-in keyboard or a wired keyboard. If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac.
- If you're using Boot Camp to start up from Microsoft Windows, set Startup Disk preferences to start up from macOS instead. Then shut down or restart and try again.
Remember that some key combinations are disabled when your Mac is using a firmware password.
Learn more
- Learn what to do if your Mac doesn't turn on.
- Learn about Mac keyboard shortcuts that you can use after your Mac has started up.
One of the downsides of using a computer, or any device with a screen, is the effect it can have on both our eyes and our circadian rhythms. While eye damage is unlikely and eye strain somewhat contentious there’s much more research that shows the effect of certain colors of light on our brains at different times of the day.
The blue-ish light emitted by most computer and mobile device displays can cause tired eyes to struggle at night, and it fools our brain into thinking it’s daytime, even when it’s late at night. The solution Apple has come up with is to allow displays on its Macs and iOS devices to shift color automatically at certain times of the day. The screen goes from blue-ish color during the day to warmer more yellow tones in the late evening. That yellowish color is supposed to take less effort to view on the part of our eyes and is less likely to make our brains think it’s still daytime. As you would expect, you can control when and if Night Shift is invoked.
What is Night Shift?
Night Shift doesn’t need a separate app, it is a feature of macOS that uses your Mac’s clock and your geographic location to determine whether it’s day or night where you are. It then uses that information to set the color temperature of your display — colder during the daytime and warmer in the evening.
The idea is that by making colors warmer, it won’t disrupt your body’s circadian rhythm, or the body clock that controls them, to the same degree. Night Shift can be turned on and off manually, or you can set a schedule for specific times.
What does Night Shift do?
Your body clock controls circadian rhythm, which has been shown to be key to a number of health conditions. It controls when you feel tired or how you sleep. Disrupting it can be a factor in both physical and mental health problems. So it’s important to go to sleep and wake up at the same time each day. By making your Mac’s display show warmer colors at night, night shift reduces the chance it will interrupt your sleep.
How to enable macOS Night Shift
- Go to the Apple menu and choose System Preferences.
- Select the Displays pane.
- Click on the Night Shift tab.
- Click on the Schedule menu.
- Choose Sunset to Sunrise to have Night Shift turn on and off automatically when it thinks it’s night time where you are.
How to set your own Night Shift schedule
- In Night Shift preferences, click on the Schedule menu.
- Choose Custom.
- Type a start time and finish time into the boxes.
How to control Night Shift manually
- If Night Shift is off, go to the Night Shift tab in System Preferences>Display and check the box labelled Turn on until tomorrow.
- If Night Shift is on, click on the Schedule menu in the Night shift tab and choose ‘Off.’
- Use the color temperature slider in the same window to control the degree to which colors change when Night Switch is turned on or off.
You can also turn Night Shift on or off manually from Notification Center.
- Click on the Notification Center icon in the top right of your Mac’s screen.
- At the very top of the window, in either Today View or Notifications, is a switch labelled Night Shift. Toggle it to switch the feature on or off.
The easiest method of all — ask Siri
You can ask Siri to turn Night shift on your Apple device on and off.
- Click on the Siri button in the menu bar. If you don’t see it, go to System Preferences then click the Siri pane and make sure “Enable ask Siri’ and ‘Show Siri in menu bar’ are both checked. Alternatively, press fn + spacebar.
- Say “Turn on Night Shift.”
- To switch it off, activate Siri again and say “Turn off Night Shift.”
Night Shift works with external displays if your Mac is connected to one (or more). However, it doesn’t work with projectors or televisions.
Night Shift stuck? Here’s how to fix it
Occasionally, usually when a Mac goes to sleep while it’s on, Night Shift can become stuck in the “on” setting. When this happens, turning it off then on then off again doesn’t seem to have much effect. There is a solution, though.
- Go to System Preferences and choose Displays then click the Night Shift tab.
- With Night Shift on, make sure “Turn on until tomorrow” is unchecked.
- Slide the warmth slider all the way to the left, then all the way to the right again.
That should fix it and you should now be able to switch Night Shift off.
Late Shift For Mac Catalina
If that doesn’t work, try running macOS maintenance scripts using CleanMyMac X. These maintenance scripts can fix problems with files on your Mac that can cause all sorts of problems. CleanMyMac makes it very easy to run them.
- Download CleanMyMac for free here.
- Launch the app.
- Click on Maintenance.
- Check the boxes next to Run Maintenance Scripts and Verify Disk Permissions.
- Press Run.
Limitations
Late Shift For Mac Shortcut
Night Shift can be great, particularly when your eyes are tired – the warmer light is much less harsh on them than cold blue light. However, it does make colors look different. So you wouldn’t want to have it on while you’re editing photographs or video. Also, you can’t deactivate it for specific apps or Mission Control desktops — it’s all or nothing. For tasks that involve writing, or working with spreadsheets, however, it’s excellent.
Night Shift is a very useful feature than can make it easier for your eyes to focus on your Mac’s display late in the evening. It also reduces the risk of disrupting your body clock and interfering with your sleep, which can lead to health problems. It’s very easy to use and there are options for how warm the screen becomes when it’s on, as well as for scheduling when it starts and stops.