Spacing and Borders can be edited in the Details tab.
There are 2 places you can add/change spacing and borders:
- Section Spacing
- Field Spacing (available for Text and Social Field type)
Having spacing and border options for both the fields and sections gives you greater flexibility when creating an email signature.
To adjust section spacing, simply click on the Section Spacing heading.
If you want to adjust the Field Spacing, you will need to click on the Field, and click on "Field Style & Spacing".