I'd love to crop out those large white spaces, but adjust & crop isn't working for me on this image. [Edit: finally managed it! Wheeee]
"This image is very large. Cropping may take longer than usual. For best results, crop your image before upscaling."
That'd be excellent advice, except I didn't upscale: this is the image that Flux Pro v1.1 Ultra gave me. And also, rather than "taking longer than usual," the crop feature doesn't even seem to be trying...