Can I increase quality of Peacock streaming via PC's web browser?

I've been noticing that the Olympics on Peacock via my Roku Ultimate looks much better than it does on my PC via web browser (tried Chrome/Brave and Firefox so far). My PC has a dual 2560x1440 monitor setup, so I was expecting it to look at least 1080p. Is there a browser setting that might be limiting the resolution Peacock video is streaming at?