I believe that recovery would be to factory state, which in your case was Windows 10. You can accomplish the same thing, restoring to a previous good state, using drive imaging tools such as Acronis or Macrium Reflect. Such a tool would enable you to image your current state, your Windows 11 OS including all your installed applications, all your settings, your data, everything. To me, that is far more useful than a factory state restore. Plus, you can store multiple drive images on a single external hard drive, allowing you to restore any one that you choose. Some Dell models also have a Reset and update option, that apparently "updates the operating system to a version which is more current than the operating system installed at the Dell factory". I've never used that, so I don't know how that works.
My laptop is Alienware Area-51m, 2019. It was installed with Windows 10 Pro when I bought it. Now I have already upgraded to WIndows 11 Pro for over one year. I wonder if I run OS Recovery Tools to restore my OS, which Windows it will restore ? Windows 11 or Windows 10? Thanks.  
which Windows will OS Recovery Tools restore ? 10 or 11 ?