Is there a way to reset an Upfront theme and start over?

I’ve started playing around with Upfront and, while I’m dissapointed that css is needed to style things so this is still not quite the WYSIWYG promised (I’m not a code person), I’ve been able to start to get the hang of it. I’d like to undo everything and start fresh. Is there a way to reset everything back to new? I’m using the Spirit theme.