Did you do an upgrade or clean install?
I did an upgrade from Catalina and everything works well except in Safari where drop-down boxes don't always work until I quit and re-start Safari.
I upgraded on a mid-2014 13" Pro.
What problem? Big Sur runs fine on my machine.That explains the problem, according to Apple’s Document Vintage Macs lists your 2014 model obsolete!
What problem? Big Sur runs fine on my machine.
My MacBook is vintage, not obsolete:
Vintage products are those that have not been sold for more than 5 and less than 7 years ago. Mac, iPhone, iPad, iPod, and Apple TV vintage products continue to receive hardware service from Apple service providers, including Apple Retail Stores, subject to availability of inventory, or as required by law.
So a 2014 Mac is not obsolete? Did you read the Apple document?