
Good day, thanks for your question. I am glad to assist you today. There is nothing official about this at the time being that there will be an option to disable SSO selectively in Edge although there are others who has the same thought and this will really benefit multi-tenant users. The best course of action is to cascade this either from Edge by going to the 3 dots > Help and feedback > Send feedback or via
https://techcommunity.microsoft.com/category/microsoftedgeinsider or via the Feedback Hub app and hopefully this can be implemented sooner or later.
Regards,
Paul R.