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Owners of public groups can enable join requests via Group Info > Edit > Group Type > Who Can Send Messages > select Only Members > enable Approve New Members. This update brings improved chat previews on par with iOS. Now you can scroll through them to view the whole chat without marking it as read. New buttons have been added to let you mark the chat as read, mute it, pin it or delete it. Stop Being Added to Random Groups

To do this, head over to Telegram settings and choose ‘Folders’. Here you can create as many folders as you want and add both personal chats as well as groups and channels to any of the folders. You can also order the folders you just created, but note that the default ‘All chats’ folder will always be the first one. Finally, if you don't want to disturb the other person, choose Send without sound to silently deliver the message to the other party without them getting a notification. Custom Notification Sounds To do this, choose the items you want to send and tap on the three-dot menu. Now select “send without compression”, and you are good to go.

However, Message history is the most revealing part of your phone when it comes to private information. I hope you may have some experience with it? Cons of switching Schedule Messages Message corners

delete sender's message send silent messages