Basically, the Desktop icon fonts are dynamic and change accordingly to the desktop background so that they are readable. Try this workaround and see if it helps. Open Settings > Personalization.

To change your wallpaper, open the Settings app ... Depending on your screen size, you can set desktop icons to large, medium, or small. To change the size, right-click on the desktop, go to ...

Users like to change themes, window colors, icons, mouse pointers, desktop wallpapers, and even tweak the Windows Registry or hack system files to give it and its built-in applications a cool new ...