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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當程式鎖設定後，於聊天清單上會出現一個鎖形圖示，點擊它以鎖定程式。
注意：如果您忘記了密碼，您需要重新登入到 Telegram 桌面應用程式。
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Tony Wong,
Dec 19, 2018 at 17:58