Hi Kapaji, my name is Jose. I'm an Independent Advisor and a Windows user like you. I'll be glad to help you today.
ATP is a global feature include in some subscriptions, so its deactivation affects all users. In that case, you need administrator privileges to disable it, by removing policies for the components includes on your subscription, likes Safe attachments
safe links, Anti-phishing and others.
Please, let me know if you are administrator to give you the instructions.