When you set up an additional passcode, you can use ⌘ + L forto lock Telegram.
Note: if you forget your passcode, you'll need to log out or reinstall the passcode, you'll need to delete and reinstall the app. All secret chats will be lost.
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César,
Dec 12, 2018 at 17:06
César,
Mar 20, 2019 at 21:56