Hello,
1) Provide FTP access to your site. We need to check the issue in more detail
2) Provide screenshot of the issue for better understanding.
3) Go to Theme Options > Header builder > Cart > Number Of Products In Mini-Cart > set 6 instead of 30.
4) You can switch between single product layouts here https://gyazo.com/f90258b19179dcc7a8e7e64e0e5511d2 Or enable the single product builder and choose the boxed or full-width layout in the settings https://gyazo.com/26ee35f678cb1b80691c125d2fd6eddf
5) There is no special option for this. Do you want to change font-family or font-size? On the grid or on the single product?
6) Go to Products > Brands > create brands and add products to your brands. After that, it appears on the shop page.
7) Do you mean border around the images, color of the button and the font-weight of the titles?
Regards