We need this too. Working on laptops is a pain, often having both the AI pane and primary sidebar visible. It would be fantastic to have the AI pane reset into the primary (or secondary) side bar as an option.
FWIW @WeiyiTian if you can live with the primary side bar on the right, then set it as such (Workbench → Side Bar → Location → right) and the AI pane will move to the left. This is my current stance, but it reduces the usability of other tools (debugger, project outline, etc).