If you need to know everything about Telegram, they have a nicely categorized FAQ page so you can refer to it for deep information. To enable this go to Settings and choose “Privacy and Security” from the list. Next, tap on “Passcode Lock” under the Security heading, then set your password lock on! Hide Telegram Profile Photo
If you like to use dark themes only in the night so that the app doesn’t blind you, enabling auto-night mode can save you a lot of hassle. Once you turn the auto-night mode on, the app will automatically switch to dark mode at the scheduled time. To enable auto-night mode go to Settings-> Chat Settings-> Themes and tap on Auto-Night Mode. Here you can select between Automatic and Scheduled. If your device is stolen or someone took it, and you don’t want him/her to see the messages in your chat window, then you can simply terminate all the active sessions with just one click using your Mac, Desktop, Linux or Web client. This means you can start typing a message on your mobile and continue on your desktop. The draft will remain in the editing area on all sync devices until it is sent or deleted. Mute a Telegram chat
If you’re using Telegram with the calls, secret chats feature, which provides end-to-end encryption for your messages, You can also be locking down the app itself with a passcode, PIN, or password automatically. With Telegram, you can send thousands of high-quality stickers right from the chatbox. Just tap the “sticker icon” on the left bottom, and it will show you dozens of trending stickers and masks. You can search for specific stickers and add them to your virtual keypad. On WhatsApp and other messaging apps, you can send uncompressed media by changing the media extension to something like PDF or EXE. However, on Telegram, you don’t need to take this hacky route for sending uncompressed media files. Just select your media and tap on the 3-dot menu. After that, choose “Send without compression” and that is it. How awesome is that? This single Telegram trick has saved me so much headache when sharing photos. Everyone (default one: Allow everyone to view your profile.
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. Telegram Schedule Options
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