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The Facebook app looks like a white "f" in a blue square icon on your home screen, or in a folder. This button is located in the lower-right corner of your screen. It will open your navigation menu on a new page. This option is located towards the bottom of the menu. Your options will pop up from the bottom of your screen. This will open your Settings menu on a new page. On some versions of the Facebook app, you will see a Chat Settings option on the pop-up menu here. In this case, select this option. This option is listed next to a gray speech bubble icon. Turning off this switch will disable mobile chat on your iPhone or iPad. You will appear offline to all of your friends on Messenger.
Open the Facebook app on your iPhone or iPad. Tap the three horizontal lines icon. Scroll down and tap Settings. Tap Account Settings on the pop-up menu. Scroll down and tap Chat Settings on the Settings menu. Slide the Chat switch to .