Why does vivo display the corner mark after viewing the information?

1, you missed reading the short message, and there are unread short messages, so there are unread short message icons on the desktop.

2. Maybe you have read the short message, but you accidentally marked the read short message as unread, and there is still a short message icon on the desktop.

3. Maybe your mobile phone's short message capacity is full and you can't receive new short messages, so there are still icons on the desktop.