These are options to control/toggle different components on your page.
So if you add a modal on your page, then add a button, selecting the Action Toggle > Modal and then selecting your modal id, this button will show the modal.
This works the same for the rest of the components you see in this dropdown.
I added a dropdown to my page
In Button 1 Action Toggle i selected Dropdown but it is not asking which dropdown to toggle
and on clicking button dropdown is still visible
The dropdowns in bootstrap require a specific markup. You need to wrap the button and the dropdown in an element with a class of .drodpown for it to work.
Example: