Title bar, Mini-cart and cart on Mobile

I really like your theme, but there are some points that I find unsatisfied, hope our team can release an update to fix some of the following errors.
1st: The title bar is not pinned when used on mobile platforms.
2nd: The Mini -cart don’t have price information right next to the quantity when using on the phone
3rd: The presentation of information related to the shopping cart is not beautiful, difficult to watch when using on the phone

The page I need help with: [log in to see the link]