I know this problem. I usually turn on this screen lock function. First of all, on Tencent's stock selection app, select the stock you are concerned about, click on the stock and enter the details page. Then find more buttons in the bottom column of the details page, that is, the graphic of "…" After clicking, you can see a "lock screen", just click Settings. The most important thing is not to forget the permission to turn on the mobile phone system. Otherwise you can't see the details on the lock screen.