Found related issues for users who upgraded to 5.8: https://ww.wp.xz.cn/support/topic/problems-with-common-min-css-in-5-8/
I worked around this by adding the code mentioned in the thread to unload the common.min.css for now.
Who should fix this? Is this a theme issue that needs to be addressed or WP 5.8?
That does indeed fix the Width issue. I am using the theme “Vantage Premium” FYI. Thanks for the help!