On the initial start of Mac OS 10.9, the operating system will prompt for a default system language. If this initial option needs to be changed later on, it can be done so through the system preferences application. Choose Apple, System Preferences, Universal Access. Select the Seeing pane. To reverse the display and show white text on a black background, choose the “White on black” option. There is also an option to remove all color and use a grayscale display. Changing Font Size of Individual Apps in Mac OS X. We have shown how to change the text and font sizes in many other Mac apps before, if you want to set individual application font sizes the following articles may be helpful to improve readability: Change Finder text font size in Mac OS X; Increase the icon size on Mac.

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Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by a product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

If your macOS isn't up to date, you may be able to update to a later version.

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.

Which macOS version is the latest?

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These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Big Sur. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

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If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.