Hi @LinGuanfu ! Visually that seeems correct: if you click on help/question mark do you have a menu with a list of examples ? also looking at the console output it seems the two instances are created correctly. Please try opening a design in both panels (or drag & droping a jscad file/folder). The css is not finished and could use some tweaking (or might not be a perfect fit for all use cases, but should be easy to change