The disappearance of the program icon from the phone screen may be due to incorrect operation of the utility catalog.

The application icon may be accidentally deleted or moved by the user. The user may forget about the operation performed, and later be surprised by the absence of the icon in the usual place.

Another reason is damage to system files, leading to the disappearance of some interface elements.

To fix the error, the user must change the phone settings or reboot.

Returning an icon to the Android screen

There are various methods to get the WhatsApp icon back on your smartphone using the this below:
https://messeng.ru/kak-vosstanovit-ikonku-vatsap/