You can use the flex layout that’s baked in to Xojo for masonry type views then I have GraffitiWall and GraffitiResponsive (load either then resize the browser window to see how they operate). GraffitiResponsive is probably what you’re looking for.
Here’s an example I put together for the flex layout not too long ago.
flex_example.xojo_binary_project.zip (9.8 KB)