If you're using a Mac, you have the option to deactivate your recent items list.Check out this FAQ to adjust your settings. Turn Off the Recent Items List on Mac Here's how to disable the Recent items (Apple menu Recent items) feature of Mac OS X.

Reinstalling OS X Without Erasing the Drive

1. On a Mac laptop you can put the Mac to sleep easily by simply closing the lid of the MacBook Pro, MacBook Air, or MacBook. Wait about a minute, then open the lid of the Mac laptop again to wake the Mac from sleep. This should prompt the regular login or wake process, and the Mac will be usable again.
2. How To Stop Your Mac From Ringing When You Get Phone Calls Last updated on May 15, 2019 By Serhat Kurt 9 Comments This short article explains how you can disable the iPhone Cellular Calls feature so that your Mac will not ring and you will not be getting calls on your Mac when you receive calls.
3. On Mac desktops like iMac, Mac mini, and Mac Pro, you can try the Lock Screen keyboard shortcut (Control + Command + Q) or the Log Out Shortcut (Command + Shift + Q), but both of those don’t always work and you may have to turn the Mac off and back on again.

Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.

Reinstalling OS X Without Erasing the Drive

Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.

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When the recovery menu appears select Disk Utility and press the Continue button. After Disk Utility loads select the Macintosh HD entry from the the left side list. Click on the First Aid tab, then click on the Repair Disk button. If Disk Utility reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit Disk Utility and return to the main menu.

Reinstall OS X: Select Reinstall OS X and click on the Continue button.

Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

Alternatively, see:

Reinstall OS X Without Erasing the Drive

Choose the version you have installed now:

Note: You will need an active Internet connection. I suggest using Ethernet

if possible because it isthree times faster than wireless.

Jun 13, 2015 12:30 PM

To quit (close) a Mac app normally, choose Quit from the app's menu in the menu bar, or press Command (⌘)-Q. If the app doesn't quit, follow these steps to force the app to quit.

How to force an app to quit

Press these three keys together: Option, Command, and Esc (Escape). Or choose Force Quit from the Apple menu  in the upper-left corner of your screen. (This is similar to pressing Control-Alt-Delete on a PC.)

Then select the app in the Force Quit window and click Force Quit.

You can even force the Finder to quit, if it stops responding: Select Finder in the Force Quit window, then click Relaunch.

Learn more

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How to force an app to close on your iPhone, iPad, or iPod touch.