If you leave your Chromebook sitting around where it could potentially be used by others---but you don't want them to---it's easy to disable guest browsing in Google's Chrome OS so that only registered accounts can use the device. Here's how to do it.

First, open the Launcher by clicking the small circle button in the lower-left corner of the screen. Then expand the launcher window with the caret up arrow near the top. Locate "Settings" in the launcher (you may have to scroll to the second page of icons) and select it.

Click the Settings icon in the chromeOS launcher.

In Settings, click "Security and Privacy" in the sidebar, then select "Manage Other People."

In Settings, click "Security and Privacy," then select "Manage Other People."

In Manage Other People settings, click the switch beside "Enable Guest Browsing" to turn it off. When off, the switch will turn grey and point toward the left.

Turn "Enable Guest Browsing" off.

After that, close Settings. The next time you sign out, you'll notice that the "Browse as Guest" option is missing from the login screen. Your Chromebook is now more secure than it was before. Perfect!

Related: How a Chromebook is Locked Down to Protect You