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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设置好锁定码后，一个锁形图标会出现在您聊天列表的顶部，点击该图标来锁定应用。
注意：如果您忘记了锁定码，您将需要重新登录 Telegram 桌面版。
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Deleted Account,
Jan 23, 2020 at 12:49