If you want 100% of the image in view on mobile. Then it will be difficult
You would need to make the Container the same aspect ratio as the image.
To do that you need to reduce the Containers height in Mobile view.
To do that you can:
1. Select the container Block and in mobile view, reduce the Spacing > top and bottom padding
2. Select the Text inside the container and in mobile view, reduce its font size
etc.
Anything that can reduce the vertical height will help.
But you can’t force a landscape image to fit a portrait frame.