Thanks for posting your question here. If you change the style of your scrolling gallery the new style will not be automatically applied to your existing listings which were already active, but will generally be reflected in any new listings you post moving forward.
However, the “vertical” style you selected is only compatible with listings that are posted directly through Auctiva, so it will not be applied to listings that you post directly through your eBay account. Unfortunately, we just don’t have the ability to place the gallery to either side of the description unless you are listing through our site.
I hope this helps clear things up. If you need any more specific assistance with this matter, please feel free to contact our Customer Support team directly from under the “Help” tab on our site and we will be happy to continue working with you.