Reply To: Theme settings page background doesn’t appear on some pages

Hello,

The second page background image is contain because you have added the custom CSS code with the page ID that only applied on that page not the other pages: https://ibb.co/QN6qT8Y

If you want to apply the custom CSS code for all the pages then you should use the below custom CSS code:

.main-page-wrapper {
    background-size: contain!important;
}

And delete the old CSS.

Best Regards.