ok. So first, you want to disable the sign up API on the backend: https://supertokens.io/docs/emailpassword/advanced-customizations/apis-override/disabling Then you want to override the react components on the frontend to not show the button to switch to sign up and also provide

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to the component for the sign up form: https://supertokens.io/docs/emailpassword/advanced-customizations/react-component-override/usage