There is only one template - 'Click' in your project.
The 'Click' template has wrong configured in action events, I've revised it then it can be opened and active the drop down at righ hand side.
Now, I've further created two form fields with 'AJAX' action, then setting a form submit template with 'auto-submit' action, the result can be refreshed properly along with the options in dropdown. See the attached new project.
In general, to find specific action events, you can use Chrome browser 's inspector tool, please you refer to the below topic: