Any iZotope products in Adobe Audition looks bad when Windows display Scale setup 125%
This is definitely an Adobe issue.
I don't know what is the state of their development right now, but i know for sure that in the beginning of 2024 only Photoshop and Illustrator had support for high DPI scaling.
What is your Audition version? If it's older than 2023/24 then it has no support for such option.