Hiya AdMaster. UNA uses FontAwesome icons. As of 9.0.0-RC9 FontAwesome 5 is supported. In general the same as in FontAwesome rules of icons naming are applied in UNA.

Check your studio for Font Awesome Pro. As for the icon colors and sizing... good luck...

https://unacms.com/wiki/Icons#:~:text=UNA%20uses%20FontAwesome%20icons.,naming%20are%20applied%20in%20UNA.