Hello,
Thank you for reaching out with your question.
As stated in Shared PC technical reference, EnableSharedPCModeWithOneDriveSync option only changes "Prevent the usage of OneDrive for file storage" policy setting.
You can use standard "EnableSharedPCMode" option, which you have, and change "Windows Components/OneDrive/Prevent the usage of OneDrive for file storage" option from Enabled to Disabled.
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Best regards.