I know there are ways to downgrade Windows 10 Enterprise to Window 10 Professional with suggestions like this here: Is there a way to downgrade Windows 10 Enterprise to Windows 10 Pro?
However, I'm wondering if its just easier to enter a license key! Are there any ramifications to just entering a new license key into Windows 10 and then rebooting to activate Pro and leave Enterprise?
Also I'm aware of Enterprise being installed for a reason due to being installed by IT from a company in question however... doesn't apply here.