Most computers running Windows 11 can run Windows 10 as licensing information is stored on Microsoft servers during initial activation.
A large number of computer users moved from Windows 11 to Windows 10 during its first year.
Make free or pay backup images of the Windows 11 installation > save to another disk drive or the cloud
(Acronis, Aoemi, EaseUS, Hasleo, Macrium, Paragon, etc.)
Clean install Windows 10.
Clean Install Windows 10 | Tutorials
Download Windows 10 ISO File | Tutorials
At any time the Window 11 image can be restored.