I was able to insert code that I found in this group to modify the image size in the Collage / Collections section so that the images (2) are of equal size. It works great!
I want to add additional Collage / Collection sections beneath this one, with the format of 3 equal sized images on the same row. I'm able insert the Collections, however they take on the sizing of the original Collections (2 small and 1 large). Would like to be able to add more than 1 row. Thank you!