Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
'Allow single sign-on for work or school sites using this profile' option allows non-AAD profiles to be able to use single sign-on for work or school sites using work or school credentials present on the machine. This option shows up for end-users as a toggle in Settings -> Profiles -> Profile Preferences for non-AAD profiles only. If you enable or disable this policy, 'Intelligent enablement of Single sign-on (SSO) for all Windows Azure Active Directory (Azure AD) accounts for users with a single non-Azure AD Microsoft Edge profile' will be turned off. If you don't configure this policy, users can control whether to use SSO using other credentials present on the machine in edge://settings/profiles/multiProfileSettings.