You can customize the author fields icon using the Combo Blocks plugin. This article will help you to customize the author fields icon.
To begin, insert an “Author fields” block.
Click on the “Icon” tab.
Click on Choose Icon button to select the icon.
Now select the icon position by clicking the dropdown options.
Now you can add “Color” and “Background Color” to style the icon, select the display style, and add some padding-margin.