The Horizontal Blocks plugin introduces a Notion-style layout experience, allowing you to arrange markdown content into resizable side-by-side blocks. It uses a special code block (`horizontal`) where content is split using `---` separators to form multiple columns. You can add any valid markdown including headings, lists, links, and embeds, and the plugin supports auto-scaling images for better visual alignment. It also remembers column widths between sessions for layout consistency. However, since it operates within a code block, task checkboxes and dataview queries won't function inside it.