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Kumar_ShahKumar_Shah 

How to prevent default contact assignment on Cases created by Community Users?

A Contact Support Form on a community allows users to create a case for a customer. This form contains customer contact information (email, name, phone, etc). When a case is created, it populates Contact Name by default as Community User and populates an Account Name that shares a case with a community user. 

I don't want to populate Account Name when a case is being the case and still want to share the case with the community user. 

P.S. In Sharing Setting, I don't want to uncheck the "Grant site users access to related cases" option.
SwethaSwetha (Salesforce Developers) 
HI Kumar,
Your ask seems similar to https://salesforce.stackexchange.com/questions/288205/how-to-prevent-default-contact-assignment-on-cases-created-by-community-users

Does the approach listed help?