You can set up Conditional Field options so that the field becomes visible only after certain criteria are met by following these steps:
Go to your form's configuration page.
Select the field.
Conditional Field section
Click on "Add Condition" and choose your conditions.
Only fields that are themselves not hidden by conditions will be taken into account in conditions! E.g. Let's assume that field A is only shown for a certain state of field B. If field B is hidden conditionally, field A will not be shown even if the state of field B is correct.
Conditions based on fields that are not on the form at all (i.e. not shown in the Fields section of your form's settings page) will still be evaluated.
If all form fields are currently hidden by conditions, you will see a message on the form saying: "All fields are currently hidden by this form's configuration."