The interface of Form Builder consists of the following parts:
The Primary Sidebar and all the Form Builder views are displayed as unfolded by default. Click the arrow-shaped Toggle Sidebar button on the Toolbar to hide Form Builder views:
After that, VS Code will display only the Form Builder’s Design Area and Toolbar unfolded:
Click the Toggle Sidebar button to unfold the views:
All the Form Builder views will be displayed again:
Also, you can toggle off the Primary Sidebar from any VS Code’s area by clicking the button of that area on the Activity Bar:
After you click that button, the Primary Sidebar will be hidden:
You can unfold the Sidebar again by clicking the area’s button on the Activity Bar: