To customize the display of footer area, on your WordPress dashboard navigate to Appearance > Customize > Footer > Footer Main or Appearance > Customize > Footer > Subfooter for subfooter area. There you can modify the layout, color, size, and upload custom image for your main header background.
Do not forget to click save & publish after making a change.
Custom HTML Code
You can also add any HTML custom code to customize the footer within Appearance > Customize > Footer > Before & After Footer.
