Hyde template showing background on only some pages

HelloI am using Hyde template and I can't seem to find how to add the background image to the main. The folders and pages I created previously show that they have background image, but not where to change it. I started this months ago and now I don't remember how I did it!

When I go to site styles and click on a page with the background it will say Main/intro padding with background. If I click on a page with no background it will say intro padding with no background. No options to add a background. I want the background on all the pages.

I'm a noob, so still figuring things out .Any help would be appreciated

Thanks.

Can you share site url?

The Site is not live yet, still working on it.

@ShadowElf You can setup password & share site url. https://beaverhero.com/squarespace-how-to/#HowtoSetupPasswordShareSiteURL

I just went ahead and made it public longshipluxurygoods.com

I found it! It's under page thumbnails.

Add a page thumbnail

Page thumbnail images appear in Index Pages and create per-page banner images in certain templates.

To set a page thumbnail:

In the Home Menu, click Pages.
Hover over the page in the left panel and click  to open Page Settings.
In Page Settings, click the Media tab.
Drag an image into the Banner/Thumbnail Image box or click Add Image. You can also click Search For Images to reuse an image or add a stock image.
Click Save.