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Explore the world of Mac. Check out MacBook Pro, iMac Pro, MacBook Air, iMac, and more. Visit the Apple site to learn, buy, and get support. An app may use an NSScreen object to retrieve information about a screen and use this information to decide what to display upon that screen. For example, an app may use the deepest method to find out which of the available screens can best represent color and then may choose to display all of its windows on that screen. The application object should be created before you use the methods in.
Hello and welcome to my User Tip
Sometimes you have a problem with System Preferences or something related to it, like it remembering your screensaver or desktop selection, or perhaps it won't launch or launches funky.
This procedure is for deleting the 'preferences' file(s) that is located in your (hidden) User/Library folder that can resolve issues like this.
When the computer is rebooted and the associated program launched again, it recreates this file, but blank of preferences, thus since it's rebuilt it's free of problems.
This procedure also works for other programs like iPhoto or iTunes, or whatever that stores a preference file (.plist) in the (hidden) User/Library folder, the procedure is the same, just sub out the program your having problems with .plist file instead of the System Preference .plist file below.
Known preference files issues:
com.apple.systempreferences.plist (corrupted/not launching System Preferences)
com.apple.desktop.plist (corrupted/not working desktop picture changes)
com.apple.safari.plist (safari issues)
See the Steps #12 and #13 for OnyX and it's preference file checker to find other corrupted preference (.plist) files that might be causing your issues.
So we are going to delete a preference file in a hidden folder, this will only affect the preference file, not your personal files or programs.
1: Go to the Finder and select Go menu and Go To Folder
2: Now paste or type
~/Library/Preferences
![Screen Screen](http://is4.mzstatic.com/image/thumb/Purple49/v4/92/4a/77/924a7768-0c65-d6af-6df1-9493b60bd47a/source/360x480bb.jpg)
3: Press GO! and a folder will appear
4: Scroll down and find
com.apple.systempreferences.plist com.apple.desktop.plist (or whatever program your having problems with)
5: There may be two of the same named file, drag the one you can to the Trash can
![Kcn Screen Mac Kcn Screen Mac](/uploads/1/2/5/8/125870479/959055397.png)
6: Restart the computer and open System Preferences (or problem program) and reset all your preferences again
If you're working with a small screen or just need to focus on one specific app, you can use full-screen mode in macOS to brush unused apps aside and commit your entire screen to a single app.
How to enter full-screen mode
- In the top left corner of the app window, click the full-screen button. It's green and looks like two arrows pointing outward
- Alternatively, use the keyboard shortcut Control + Command + F.
Navigating full-screen mode
- To access to the Mac menu bar, hover your cursor over the top of the screen. The menu bar will drop down so you can access its tools.
- If you need to get access to the Dock, just move your cursor toward the Dock. The Dock is either on the left, right, or bottom of your Mac's screen.
- To switch between apps while in full-screen mode, you can use a three-finger swipe gesture on your Mac trackpad or use the Command + Tab shortcut keys.
How to exit full-screen mode
- Hover your cursor over the top left corner of the screen until you see the window bar. Then click the Exit full-screen button. It's red and looks like an X.
- Alternatively, use the keyboard shortcut Control + Command + F.
Questions?
Anything we missed? Run into any trouble using full-screen mode? Gimme a shout in the comments below or over on Twitter!
macOS Catalina
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