Symptoms
You can change the border of a form using the GUI.
One can not draw a border around a view using the GUI.
Diagnoses
At the moment there is not way to add a border to a view using the GUI.
You can make changes to the theme by editing the view border section of the CSS file as a workaround.
Resolution
This ticket was routed to LABS and the LABS support engineer working the ticket has logged a feature request in TFS. This should be included in a future build of K2 smartforms.