You've upgraded to Windows 11, but realize you like the old operating system better. Perhaps it's the truncated context menus or less-flexible taskbar that makes you wish you hadn't upgraded. After all, Windows 11 is not a must-have upgrade at this point. Whatever the reason, if you want to rollback to Windows 10, you can, provided that you installed Windows 11 within the last 10 days.
After 10 days, Windows is likely to purge the old OS files, making it impossible to do a rollback, though reinstalling Windows 10 is always an option as is making Windows 11 look like Windows 10. We've seen a video which suggests that renaming the C:\Windows.old directory to C:\Windows.notold and then changing the name back to C:\WIndows.old could allow you to extend your Windows 11 test beyond 10 days, but you would have had to have done the first renaming within your initial 10-day window.
So, assuming you are within the timeframe, here's how to uninstall Windows 11 and roll back to Windows 10.
How to Uninstall Windows 11
1. Navigate to the Recovery submenu of Settings. The fastest way to get there is to search for "go back to Windows 10" and click the top result. You can also browser to Settings->System->Recovery.
2. Click Go back.
3. Check off one or more reasons for your uninstall when prompted.
4. Click "No, thanks" when asked to check for updates instead of rolling back. Microsoft would love to keep you on Windows 11, but if your mind is made up, it's made up.
5. Click Next.
6. Click Next again when warned that you need to remember your password from Windows 10. This should go without saying.
7. Click "Go back to Windows 10."
The system will now restart and go through a restoration process that should take a few minutes.
When that completes, you're back on Windows 10.