If you just upgraded to Windows 11 Pro within the last 10 days, you have a simple rollback option:
Open Settings.
Go to System > Recovery.
Under Recovery options, look for the "Go back" button next to Previous version of Windows.
Click "Go back" and follow the on-screen instructions.
If it's been more than 10 days since you upgraded, the rollback option is no longer available. You'll need to perform a clean install of Windows 10 Pro.
Back up all your data and Download the Windows 10 Media Creation Tool: https://www.microsoft.com/software-download/windows10.
Create a bootable USB drive: Use the Media Creation Tool to create a bootable USB drive with the Windows 10 Pro installation files. And go for a clean installation.