I got Trunks Avatar with 10 win rewards of the Grand Opening Memorial Battle! !
Since it is a big deal, set it as the home screen avatar. Home screen avatar and deck avatar have different settings.
Home screen avatar settings
From the menu icon at the bottom of the screen, go to the menu screen and go to the top profile.
When the profile screen opens, tap the change icon at the bottom right of the icon to display all the acquired icons, so select the icon you want to set from among them and the icon on the home screen will be changed.
You can also change the title on this screen.