Hello, @Kazi Sabit,
1- Quick view: I have set the 2 buttons (Quantity and add to cart in 1 row as you mentioned check the resulting image here: https://postimg.cc/yWvZp0jZ) I have added a CSS code in the theme options to make it work: https://postimg.cc/bGcDSgyK
2- Your issue is resolved now kindly check back to your site after clearing the browser cache. Here are the result images: https://postimg.cc/sQ8R16yW and https://postimg.cc/wynS91cc
3- I don’t see any dots on your site as you can see the screenshots I attached in point number 2 it is working just fine.
4. Sorry to say, that this is not a way to use the space everything/element is set as default you cannot adjust it like this way. If there was any possibility I already did it for you.
Regards 8Themes Team.