@EnterpriseArchitect Thanks for posting in our Q&A.
Based on my research, there is no method to make it.
Currently, there is a setting "Enable saving passwords to the password manager" under Microsoft Edge in Administrative Templates profile. If you disable this policy, users can't save and add new passwords, but they can still use previously saved passwords. However, it will not distinguish the personal account and corporate account. It restricts all accounts to save their passwords.
And the setting "Disable synchronization of data using Microsoft sync services", it can't choose what content to sync.
Hope it will clarify something.
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