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I apologize, but I am not quite sure what you mean?
You can add more fields to it by enabling them from the toolbar.
If you click on Prefix it will add a field in front of the First Name field. Similar is with the Suffix - creating the field at the end and Middle Name creating a field in between First and Last name fields.
Now if you wanted to increase the height or width you can do that using CSS, for example:
.form-input > .form-sub-label-container > input.form-textbox
Changing the width and height will allow you to adjust the width and / or height depending on what you want to accomplish.
You can see here how to inject the CSS such as above.
If you tell us more details on what you want to accomplish we can help you set it up properly.
I selected the link you provided for CCS – and I am presented with “Page cannot be displayed.”
Please try this link instead
I am not sure what prevents your browser from opening the link provided by our colleague Ben, but it do works fine when I clicked on it.
Please inform us if there are still issue.