Work out one consistent edit recipe and apply it across a set of photos. Set the crop, grade, background treatment or resize once, then run the same instruction over each image so the whole batch matches.
How the batch photo editor works
Upload the first photo from your set and write the recipe you want applied to every frame, for example 'crop to 1:1, warm grade, plain white background'. Run it and check the result. When the recipe looks right, upload the next photo and run the same instruction unchanged. Keeping the wording identical between runs is what keeps the batch visually consistent.
Tips for the best results
Write the recipe as a list of concrete steps rather than a mood, and reuse the exact same wording for every image. Test on the hardest frame in your set first, since if the recipe survives that one the easy frames will be fine. Keep a copy of your working instruction to paste in each time.