The Mail app has new features, many of them good, but because things are not exactly like they were back in Catalina, users may be annoyed and unable to find what they need to. See also: How to Change the Login Screen Background in macOS Big Sur Some of the changes to macOS mean that users will have to figure out how to set up things like they want them, or how they used to be.
As expected, not every change will agree with every user. MacOS Big Sur came with many design changes.
