In our business there are sometimes people who work for two Accounts, so we are setting up Many-to-Many module association for the Account-Contact relationship.

Ideally, I would like to convert the existing Account Name field in the Contacts module from a Select to a Multi-Select Lookup. Is this possible?  (I have not found a  way).

Second best is adding a new Multi-Select Lookup called "Accounts" to the Contacts module, then delete the old "Account Name" field, but the customizer says I can't delete the Account Name field. So I put it in the Unused Fields section. This makes the Contacts module work how I want.

BUT: The Accounts module has both "Contacts" and "Contacts1" sections - "Contacts" is from the hidden "Account Name" field in the Contact module, and "Contacts1" is from the new Multi-Select Lookup.

How can I either convert the "Account Name" field on Contacts to a Multi-Select Lookup, remove the "Account Name" field entirely, or hide the "Contacts" section in the Accounts module, leaving only "Contacts1" (which I will try to rename)?