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The Thank You page is only displayed when a user submits. However, you can add a hidden field with a "Thank You" message and a condition that when the user does not agree, all the other fields are hidden while the "Thank You" message field is shown.
Here's a guide that may help you with conditions: Smart Forms Using Conditional Logic
I made a sample form where you can see the condition in action: https://form.jotform.com/60070638101948
You can also clone this sample form to your account if you want to view the conditions: How to Clone an Existing Form from a URL
Do inform us if you need further assistance,