Click on the logo image and upload an image to the site or select one from the gallery. Check the image and look to the image settings on the right. Ensure “Full Size” is selected from the Image Size dropdown before clicking Insert.
Next, look to the right sidebar of the page and scroll down to the Preview Image. Click this and replace it with the same logo (image size setting will be absent).
Changing Background Image:
The background photo in this section can be changed by hovering the section and clicking the Edit Cell icon at the top left corner of the cell. Then, navigate to the Styling tab and click on Background. Click the image to replace it. Ensure to select Full Size. For very large images, select Fullscreen Sections/Sliders instead.