How to unlink contacts and accounts

We are new to Monday CRM. We have Accounts, Contacts, and what we call Partners. Whenever we add a contact it automatically adds an account based on the domain of the email address. We don’t want to automatically create this. I have reviewed all automations and cannot figure out what is adding the account.

Go to the your Account board (where unwanted item is created) and click on the 3 dots (top right menu), choose Activity Log. There should be some sort of log of who/what created that new account item, if there will be monday logo for that item, it means the item was created by automation. Other place where I would look is Automate (top right menu) and check the Run History or Usage tab, but Contact board should be selected.