Windows 11 settings are worse than they were prior to Windows 10. Before I could have multiple windows open for settings to monitor progress (like of windows updates) or check settings against each other. Now it's a monolithic interface that forces me to back out of something I'm looking at to look at something else, like a website that doesn't let me open multiple tabs to browse it. Terrible UX IMO.

As a developer who has worked on similar things, that interface can prevent a lot of trouble of the kind "What if the user edits a setting that updates something in another part of settings, which might also be open at the same time?" - or even the same settings screen opened multiple times. It is rare that such cases come up for users, but they can be very annoying and time-consuming to deal with. Perhaps that was the motivation.