To replace the main menu banner (or to add another banner on other submenus), go to Edit > Menu and change/add an Informational Item. The name of the item or its description do not matter.
Once the item is added, to the menu, position it on the top left of the other items, so it will be displayed first (failing to do so will result in undesired and confusing positioning in-App).
Then click the gear icon to access the item’s option.
Look for the Advanced checkbox and mark it to reveal the advanced options. Then look for the CSS Class option.
Then type the code snippet:
After accomplishing that you can upload your image. Images work best if sized between 1200x400px to 1200x300px.
After uploading the image, click the green confirm buttons and don’t forget to hit save on the top bar to commit your changes. They will be instantly available in your app.
How to Remove the Header Image
To remove your header image completely, delete the Information Item that holds that image. Identify the item in your menu, click Move/Delete on the top bar and then click on the grey X on the proper item.
Don’t forget to hit save on the top bar to commit your changes. They will be instantly available in your app.