FYI to folks who are trying it out now - on step 3, you'll have to click on an element on the preview UI so you could customize it. You can customize it to show

FYI to folks who are trying it out now - on step 3, you'll have to click on an element on the preview UI so you could customize it. You can customize it to show a particular column by clicking the + button. Without customization, the resulting page will not show anything. I'll fix this in the next iteration by providing defaults.