Lots of people have requested this over time. I'd like to see how many are interested. Add a 👍 reaction to this issue if you would like to see this feature added to Masonry and Isotope. Subscribe to this issue using the button in the sidebar.

The Masonry layout algorithm works by looking at vertical space. However you may want keep the left-to-right order of the items.

In the past I've recommended Masonry Ordered, but it's now out of date and no longer compatible with current version of Masonry.