Using masthead photos on a long-form story

I'm wondering if it's possible to make the masthead presentation mode for photos to be centered when it's placed on a long-form story. Right now, if you use a masthead photo on a long-form story, it floats left. However, the headline is centered, so it looks off. You can get around this using the "showcase" presentation mode for photos, which spans it across the whole page, but it adds the title of the image and grey lines on the top and bottom of the image. It would be nice to display above-the-headline photos that look clean. We used to be able to do this before with the "panoramic" presentation before it switched to an actual swiping panorama. It displayed the photo cleanly above the headline with the credit and cutline.