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Create Channel Color-theme of the app Appearance section in Telegram

Large file size limit Use These Great Telegram Features to Become a Pro 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. Better Bots

In order to protect your personal information, Telegram automatically terminates your old sessions after 6 months. However, you can choose to get rid of the old sessions sooner in order to further boost security. Can Telegram be used on PC? In Telegram, you can adjust the color and background. If you like, you can even set up your own custom theme to make Telegram look exactly the way you like. Telegram Settings

Hopefully, I have listed enough Telegram features to help you understand why the Telegram app is so popular and secure. Set Auto-Delete Timer for a Telegram Chat