The only working method to go from the Pro edition of Windows 10 to the Home edition is to clean install Windows 10 using a bootable USB.
If you have already reinstalled Windows using a bootable USB and the Pro edition was automatically installed somehow, this method should force the USB to install the Home edition.
Right click your Desktop, choose New - Text Document
Paste the text below into that document
[EditionID]
Core
[Channel]
OEM
Then choose File - Save As, at the bottom of the Save As dialog, change file type to 'All Files' then save that file as ei.cfg (note you must manually add the cfg file extension)
Then copy that ei.cfg file into the Sources folder in your Installation USB.
Then start the installation using the USB.