@Paul160 hello, first do a forced reboot: press and hold power button and volume button, about 10 sec until the phone reboots.
Yes, after restarting the phone, this icon remains, it clears the cache and data of the One ui Home app.
To do this, go to Settings / Applications and look for the ONE UI Home app, in storage, delete the cache and data. You will have to reconfigure the desktop icons. Greetings.