From there, you will reach the Legal and Policies option. To deactivate Messenger, navigate to the settings that appear when you click on your profile icon.
The option only becomes visible once your Facebook account is no longer active. If you want to deactivate Messenger, you must deactivate your Facebook account first. The act of account deactivation on the two apps is also intertwined.
You can, however, use Facebook without having an account on Messenger. There is no way you can use it without also signing up on Facebook. However, if you intend to use the Messenger app, it must be associated with your Facebook account. Messenger is linked with the Facebook platform, but you can operate either of them independently. Facebook Messenger is an instant messaging app that provides you with an easy and quick way of communicating online.