When adding a new feature via the Theme customisation menu - you may find the feature is wider than the existing page.
This is because the Section width is not set to the same width as the page content.
Fortunately we have an option add custom css classes to your Instant Brand features via the Theme customisation menu
Simply follow the steps in this article and paste the relevant theme CSS value in this box
If your theme is not listed - please reach out to us for assistance and we will determine the correct settings for you