Can I change the field type of an element in my form?

Yes - you can...and it's even very easy to do.
Each element you use in your form has a type. It can be a Textbox, a Dropdown, a Signature, a File Upload. every field type is different and has its own look and functionality. 
Usually when a user drages a certain element, (for example a Signature ) he knows what he's looking for and there is no logic in changing it into something else. However, sometimes the user drags a radio button and then wants to change it to a dropdown - and this not only makes sense but it is also possible. :-)

So all you need to know before starting is that:
A- not all elements can change their type, and those that do are divided into two groups:
Group 1:  includes the Input elements:
Textbox, Numeric, Textarea, Email, URL and Price.
Group 2: includes Multiple input elements:
Dropdown, Radio, Checkbox, List button.
B- You can only change an element into another element in its group.
C- if you original element has a certain style (like background color or font color), a condition or value rule - it will remain on the new field type after the change.

Let's try it out:
1- Create a new blank form
2- Drag a Textbox
3- Drag a radio button.

4- Test the form:
- Publish it as URL and enter data in the form.
5- Now go back to the form in the form builder.
6- Select the Textbox on canvas and go to: Properties panel > Elements tab > Settings option > Advanced category
* Please notice that the field type is specified next to the "Basic" category header text.


7- Open the 'Change type' dropdown, choose for example Numeric and press on the "Apply" button.


8- Now you will see the element change on canvas (in this example the Textbox and Numeric field look the same so you will not see a difference on canvas).
However, if you look at the Element "Basic" category again you will now see that the type has changed to 'Numeric'.
9- Do the same with the Radio button: Select it on canvas and change it in the properties panel to "Dropdown". This time you will see the Radio change on canvas.
10- Now return to your published form again and refresh it - the fields will change and not just visually...if you try to enter data in the Numeric field for example - you will see that you can only enter numbers in it.

Watch the video