Lurking Minicart for WooCommerce v1.2.0 has just been released. It add a setting to make the minicart sticky on mobile too, and a setting to hide the minicart when it’s empty.
Hide minicart when cart is empty
By default, the minicart is always displayed even when it’s empty. When there’s something in the cart, your customer can see a number or amount; when it’s empty, just the icon. This version adds a new setting that allows you to hide the minicart when there’s nothing in the cart.
Edge cart on mobile/small screens
When we released this plugin, we deliberately made the left/right edge minicart not sticky on mobile views because things can get rather cramped on small screens. If you’d prefer to make the minicart sticky on mobile, there’s a new setting you can enable to let you do that.
You can update to the latest version from your WordPress plugin admin page. Here’s the full Lurking Minicart for WooCommerce changelog.