Click "Underlying Setting" below and modify the value of "Wall Transparency", then you can go to modify the transparency of the image. Click "Show" to show or hide the underlying image. Click "Delete" to delete the image.
Click "Underlying Setting" below and modify the value of "Wall Transparency", then you can go to modify the transparency of the image. Click "Show" to show or hide the underlying image. Click "Delete" to delete the image.