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System Default (Android) or System (iOS): Matches the theme to your operating system's current mode. To lock a chat go to Settings->Privacy and Security->Passcode Lock and enable it. Once you create a passcode and enable it, you will be able to lock and unlock your chats by tapping on the lock icon at the top right of the app. On desktop applications, chat folders are displays in the sidebar. In the mobile app, these folders are arranged in tabs that can be easily swiped between.

To schedule and send silent messages, users can simply type out their messages, but long tap on the send button instead of simply pressing it. This will show you the schedule and silent message options. Thank You There's also a hidden menu that appears when you long-press on the Send button. Choose Schedule message to delay sending until a time in the future. You can also tap Send When Online to send the message when the other person is next active on Telegram. Animated Profile Picture Creator on macOS

Telegram allows edit, unsend sent messages even for the other people on the same chat. It allows to unsend messages shared with the first 48 hours after sending. Edit and replace pictures while sending App Passcode Options Premium Doubled Limits

Telegram Chat Background What is Telegram?