NOTE: If you only want to use Classic or V2 Elements go to the Settings page of Cornerstone (X) or the Content Builder (Pro).
I understand the new features can look overwhelming at the first glance, but you will get used fast.
I personally prefer to use mostly the Classic Element as well.
Lower Layer and Uperlayer are really cool if you want to add texture to the upper layer with an image with parallax on the lower layer. It open doors too many creative things...for example..vectorized raindrops with a transparent background over a lower layer with other drops which can give some nice effect
Regarding your site, it seems not to be working as expected, the images and the background colors should work just as before, and I can see on your video they don't show.
Please check if you have a background color (white) selected on your row or column.
If that is not the case, please provide your login credentials so we can take a closer look.