When you launch Messenger, you'll see all of your Facebook conversations in the Chats tab. You can also get to this tab from anywhere by tapping the chat bubble icon at the bottom of the screen. If you're using Messenger on a computer, your chats appear in a list running along the left side of the page. A list of options will appear.  If you don't want to be bothered by Messenger for a while, tap Do Not Disturb (iPhone/iPad/Computer) or tap On to switch it to Off (Android). Select the amount of time you want notifications muted—they'll automatically resume once that time period ends. Previews shows you the name of the person messaging you as well as the contents of the message in the notification. Turn this off if you don't want this information appearing on your lock screen. The options are a little different depending on your platform, but both Android and iOS allow you to control what happens to your phone or tablet when you receive a notification in Messenger. If you want to further fine-tune your notifications, you'll need to do so in your Android, iPhone, or iPad's Settings app.
चैट टैब पर टैप करें: अपनी प्रोफ़ाइल फोटो (मोबाइल) या गियर आइकॉन (कंप्यूटर) पर टैप करें: Notifications & Sounds सभी नोटिफिकेशन को ऑफ कर दें (ऑप्शनल): प्रिव्यू को on या off पर टॉगल करें: अपने फोन के वाइब्रेशन, साउंड और LED लाइट सेटिंग को एडजस्ट करें (केवल मोबले पर):