Hi @manoman
You can create another image banner section and upload an image that fits the desktop. After that, you can add the codes below into the Custom CSS of each section so the Image Banner section for mobile hides on the desktop and vice versa.
Add this code to mobile’s banner section
@media (min-width: 750px) {
.banner { display: none; }
}
This code in to Custom CSS of image banner section of desktop
@media (max-width: 749px) {
.banner { display: none; }
}