Thanks for reaching out to us! You can resize the cells within a collage by dragging the border between them. You should notice the mouse cursor changes to indicate when you can drag. You can also insert images between cells by dragging them in the middle of 2 cells (you’ll see a blue rectangle appear when this is possible).
I was hoping to size them to 2 inches across, but don’t see a way to get a correct measurement. I have no trouble resizing the borders and space in between, my problem is occurring because I don’t see a way to know the measurements of the blocks.
There is one way to achieve this: first you can constrain your collage to the size you’re printing at. For example if printing at 4×6″ you could select this size from the dropdown on the left (when creating your collage). Then if you have 2 columns you’ll know each will be exactly 2″ wide when printed. If you have 4 columns you’ll know each will be exactly 1″ wide.