Samsung s20 can see new messages when locking the screen.

In general, there will be, or a message reminder will be set.

If WeChat doesn't remind you when Samsung s20 locks the screen:

1, open Samsung s20 mobile phone settings, and click Sound and Notification;

2. In the sound and notification interface, click the lock screen to display the notification;

3. Click the display content;

4. Find and select WeChat, and then set it.