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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当您设置好一个附加锁定码后，你可以使用快捷键 ⌘ + L 来上锁。
注意：如果您忘记这个锁定码，你将只能删除然后重新安装Telegram。重装之后您将丢失所有的私密会话。
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Deleted Account,
Dec 11, 2018 at 16:32