When a passcode is set, a lock icon appears above your chat list. TapClick it to lock your Telegram app.
Note: if you forget your passcode, you'll need to log out or reinstall the app. All secret chats will be lost.
        
        
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        当您设置好一个锁定密码后,对话列表上方会出现一个锁形图标。点击它来锁定或解锁 Telegram 应用。
注意:如果您忘记了锁定密码,您将只能卸载然后重新安装 Telegram。而此操作将导致您丢失所有的加密对话记录。
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            Gulu,
            Aug 12, 2023 at 10:17