When a local passcode is set, a lock icon appears at the top of your chats list. Click it to lock Telegram Desktop.
Note: if you forget your local passcode, you'll need to log out of Telegram Desktop and log in again.
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设置好一个锁定码后，聊天列表上方会出现一个锁形图标，点击它来锁定 Telegram 应用。
注意：如果您忘记了锁定码，您将需要重新登录 Telegram。
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Nice Giraffe,
Nov 10, 2018 at 15:11