Good question. The Contact widget has a field where you can choose a page’s content to display there. The page that’s selected’s content will appear on the left hand side there.
So what I’ve done in the demo is created a contact form and then inserted it into the content area of my contact page. In the widget, I selected my contact page as the page’s content to display. That causes my contact form to appear there.
Give that a try and let me know if you run into trouble.
Have a great weekend,
Bill