How to customise “My account” section?

Either i couldn’t find anything in the theme documentation or in my dashboard or there is no customizing option for my account at all and that’s very embarrassing. Please check below comments.

1. I can’t find any place or section in the theme where I’ll be able to modify the “My Account” page
2. I want to hide the “downloads” button on my account page but somehow I don’t see any relevant functionality. same from cart. I’ve used custom CSS to hide these buttons for now, which isn’t ideal.
3. In the addresses section I want to hide the billing address section. I used CSS as well and that is also not a good option. From where can I customize this part? For example, the “Add shipping address” CTA doesn’t even have relevant styling to tell me it’s a button. Surely I have to change it. Shell I do it with CSS or do I have any place where I can properly edit it, adding a class would be fine here as well.
4. How shell I customize the form in the “account details” section
5. how shell I add different sections in this sidebar at all
6. How to customize dashboard page? here are icons and that are anyway given in the sidebar. what is the logic? i need to change it as well and need to find a way to do that. How to add, edit or remove buttons from here?
7. How to remove or edit product sections and newsletter sections below, I’m registered and it still says to register to sign for a newsletter. this is dummy placeholder I know. that is not a nice thing but still okey, just how to edit or delete it specifically from here?

I truly want to believe that I’m the one who couldn’t find any relevant section to cover all of these questions and not the theme product manager who launched this kind of inflexible product. You guys did a great job but the account section isn’t flexible at all