There’s no way to “download all images” in a thread or anything (yet?), but I’ve heard whisperings of people working on tools to make it easier to manage. I think for mass production, though, Labs or the API will be better when they’re available for DALLE3.
You can control it a bit with ChatGPT - and as you see on the last image - even take a generated one and make it landscape instead of square… (Notice it said “first image” but accurately grabbed the second image as requested… so it’s still a bit wonky in some ways, but still pretty amazing…)