How to change your Mac’s security preferences (with screenshots)

In recent versions of macOS, Apple has taken great steps to make your Mac more secure. However, in some cases, you may feel the default settings go too far and don’t allow you the flexibility to do the things you want to do. So, in this article, we’ll show you how to change them. 

Be aware that changing security preferences comes with a risk attached and that you should understand the consequences of what you’re doing before you do it. Here’s how to change security settings on a Mac.

How to change security preferences on a Mac for unidentified developers

In previous versions of macOS and Mac OS X, it was possible to change security preferences to allow third-party apps from developers who weren’t “identified.” However, in recent versions, there are only two options: install apps only from the App Store, or install apps from the App Store and identified developers. 

If you want to install an app from an unidentified developer, you have to respond to a warning dialog box at the time of installation to confirm you want to go ahead. Here’s how to access security preferences and allow installation of the third-party apps on the previous macOS.

  1. Click on the Apple menu and choose System Preferences.
  2. Choose Security & Privacy, then General.
  3. Click on the padlock and type in your admin name and password.
  4. Under the heading “Allow apps downloaded from”, choose Anywhere.
Tip

If you’ve ever installed third-party apps, they may be running hidden processes or have installed hidden files on your Mac. You can check for these using CleanMyMac X. It’s notarized by Apple, which means Apple has checked it out and verified it as a suitable tool to use on your Mac.

Prevent an app from accessing your camera or microphone

Prevent an app from accessing your camera or microphone

In macOS Catalina, apps have to ask for permission to access your camera or microphone. However, even if you grant permission, you can revoke it later. Here’s how:

  1. Launch System Preferences from the Apple menu or Dock.
  2. Choose Security & Privacy.
  3. Select Privacy.
  4. Click on a microphone or camera.
  5. You’ll see a list of apps that currently have permission to access that device. Uncheck the box next to any app you want to prevent using a camera or microphone. 

Stop an app accessing your Desktop and Documents folders

In Catalina, apps must also get permission to access your Desktop and Documents folders, and that too can be revoked. 

  1. In the Privacy section of System Preferences (see above), choose Files and Folders.
  2. Locate the app you want to block from accessing those folders and uncheck the box next to it.

Altering your Mac’s security settings can make it less secure and make it more vulnerable to malware. It’s important, therefore, that you scan it regularly with a reputable anti-malware utility. I’ve recently discovered CleanMyMac X, and it has already detected macrovirus on my Mac. Here you can learn more about this nasty virus. 

CleanMyMac X scans your Mac for malware and lets you remove it. Here's how to perform a deep malware scan:

  1. Get CleanMyMac X for free and install it.
  2. Launch the app and go to Malware Removal.
  3. Click Scan.
  4. If CleanMyMac X finds any threat, click Remove to delete it.
  5. Now your Mac is clean! Remember to run a malware scan once a week to prevent anything nasty from infecting your data.
Stop an app accessing your Desktop and Documents folders

Manage Location Services

If you want to manage which apps can determine your location, here’s what you should do:

  1. Navigate to the Privacy section in System Preferences (see above).
  2. Choose Location Services, click on the padlock and type in your admin name and password.
  3. To turn off Location Services completely, de-select Enable Location Services.

    Manage Location Services
  4. To manage which apps can use Location Services, look through the list of apps and select or de-select them accordingly.
  5. Scroll down to the bottom of the list until you see System Services, and click details to see which services use your location.
  6. Check or uncheck the box next to each service to determine whether it has access to your location.

Prevent apps from receiving incoming connections

Prevent apps from receiving incoming connections

Your Mac has a built-in firewall that is turned on by default and prevents unauthorized applications from receiving incoming connections. You can also manually prevent authorized apps from receiving incoming connections.

  1. Go to System Preferences > Security & Privacy > Firewall.
  2. Click the lock and then click Firewall Options.
  3. Review the list of apps authorized to receive connections and click on the dropdown menu to the right of any you want to block.
  4. Check the “Block incoming connections” box.
Block incoming connections

Every new version of macOS brings new security and privacy features. However, often there’s a trade-off between security and convenience, and so you may want to change security preferences on your Mac. Use the guide above to do that, but don’t forget to use an anti-malware tool to keep your Mac safe.

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