If you want to edit the banner image, click on Edit Section Image & Spacing from the right hand pop-up menu in your Website Editor.

Click on “Spacing” and adjust the image padding by moving the blue dots along the scroll bars.

Here's a quick video: https://www.loom.com/share/dd0ca7750d104738ae3c3fbad3693962

You can also change your banner image from a Background Image to a Standard Image. This will remove the text overlay so that your entire banner image is visible.