It depends on how you're displaying your form and what your development "environment" is. There are various dev environments such as Oxygen that allow you to easily show elements based on a condition, such as "User not logged in". There are also plugins that allow you to do this within a page or post.
I thought that it is an option in formidable. thank you
Under the form's "Form Permissions" subtab, you can the available options for Form Visibility. As far as I know, there's nothing out-of-the-box that allows you to show the form only to logged-out users, i.e., not to logged-in users.
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You can add a hidden field with a default user id field and set the form fields condition to hide if hidden field is equal to zero.