Parents have the power to enhance safety on Facebook Messenger for their kids by changing the privacy and supervision settings. Restrict the child's account to only receiving messages from friends, and disable the contact syncing feature to ensure unknown people cannot find them. Use the blocking and reporting options to end unwanted conversations. Switch on the parental supervision features if possible, mainly with Messenger Kids, which gives parents the opportunity to approve contacts and watch the activity. Besides that, guide children not to share personal information, to stay away from suspicious links, and to have conversations with only known contacts. It would be a good idea to check chats periodically and tweak privacy settings for optimum protection.