zdnet[.]com/article/i-hate-windows-11-how-can-i-make-it-work-more-like-windows-10-ask-zdnet/
In a nutshell, this article from Ed Bott talks about using four 3rd party apps to make Win11 look and feel like Win10, &/or possibly Win7 if that's your thing. I took a quick look at the 1st two because, well, they're free -- $5 or $6 isn't going to destroy the budget, but if I can do the same stuff for free, why not?
Open Shell -- github[.]com/Open-Shell/Open-Shell-Menu -- has an installation like a regular Windows app, and gives you several settings applets you'll find in the Start Menu. It has some customization possible, and you can use a Win7 Start Menu, but in my Win11 VM it did nothing to the existing Start Button, adding a 2nd Start Button on the far left that displayed a Win7 menu when you clicked it. I figured this would only be confusing so I didn't go any further.
ExplorerPatcher -- github[.]com/valinet/ExplorerPatcher -- takes a geekier approach, from the setup file to adjusting the settings to suit you, but it worked. You'll get a lot of registry changes, as it seems to try and adjust Windows own behavior as possible rather than slapping on a bunch of add-ons. I'd suggest performing a backup, or at least setting a restore point to be safest when you try it for the first time, in case you don't like it & want to make sure you put things back.