I've been running my MBA with a 24" 4k monitor for 3 weeks now; it remains cool (35-40degC idle) and fans are off. I also use my machine in a 'professional' capacity. It's a tool.
Your posting history in the short time you've been here has been exclusively about the poor thermal performance of the new MBA, across many different threads, just like this one.
Tell me, do you actually own a 2020 MBA yourself? Have you encountered temperature problems using it with a 'larger monitor'? I'm asking because your posts just don't seem to match my own experiences with an actual 2020 MBA.