Since Facebook has removed the “Login Approvals” option from security settings, hence the only way to disable repetitive login approval codes generation and entry whenever you try logging in from a new phone or computer device, is to disable the phone number attached with your Facebook Account. Facebook automatically enables “Two-factor authentication” on your phone number whenever you add it to your account. Here’s how you can disable such a (bothersome) security measure;
Login to your Facebook and click the top-right down-arrow button to selecting “Settings” from the menu;
Click “Security and Login” from the top-left menu and “Edit” button in front of “Use two factor authentication” under “Setting up extra security” option;
Next, under “Text Message (SMS)” option, click “Disable” button next to your mobile phone number;
Re-enter your Facebook password to confirm the change;
You should see “Disabled” button next to your mobile phone number.