To avoid potential risks like revealing information, such as using someone else's device, you should know the optimal way to log out without uninstalling the app completely. In case the person installs app removal prevention software, it's as good as done.
Follow these simple steps to completely log out of your account:
Step 1: Access Settings/choose Apps/select Messenger
To completely log out of your account, choose Clear Data to delete Facebook Messenger data.
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Step 4: Locate the Facebook Messenger app to see the results of your efforts
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Currently, this is the only and most optimal solution to exit your Facebook Messenger account. Hopefully, in the future, developers will integrate the logout feature directly into the software in upcoming updates.
To use Facebook Messenger for Android, you can download it for free here