Follow these steps to display images on the section card (card layout only)
Go to the course > click on the course setting > Course format setting > Format – Edwiser course formats > Choose layout – Card Layout > Section background image – Show background image to sections in card
Now navigate back to the course > Edit a section/topic > Add any image to section summary.
Once the images are added to each section, the section cards will look like this:
Skill Level: Beginner