You can change the size of the 3D View window of the Visual Customizer to make it larger or smaller.

How to do it

From your Zakeke back-office go to Settings > User Interface Settings check the "3D View" Window's size box.

You have to set the width and the height in pixels.

Please note that the window does not change in the preview mode, always check the live version of your customizer.

If you want to restore the default size of the 3D view, you only need to uncheck the "3D View" Window's size flag.