The Insert Center Left 1 icon shows a rounded square outline on the left, three rounded horizontal bars on the right, and long horizontal bars across the top and bottom. Drawn in the Neon style on a 14px grid with a 1px stroke, it keeps the layout crisp and easy to scan. Use it for split-pane layouts, content insertion controls, page builders, and dashboard editors. It belongs to Core Neon set in the Core family.