I saw the screenshot you attached. By default, the area is limited to some specific height. So if you try changing it then it might disturb the layout of the other elements.
If you still want the CSS then you can try adding the following Custom CSS in the Custom CSS for Desktop area under Theme Settings >> Custom CSS.
By default, WooCommerce opens the first tab when the page is loaded. You can try to close it manually right after page loading by adding this code snippet to the Custom JS section in Theme Settings.