2. How can I show the cart at the end of the menu? such as the search button (magnifying glass).

Thanks

1. I need to see your URL in order to see what CSS your custom component at the bottom applies.
2. The cart appears once you add items in it. Do you want to show it by default?

1. I don’t have a URL yet, as I’m working with localhost.
2. Okay, now I noticed that when I click on buy on the item the cart appears, would I have it always visible even without adding any items?

and another question:
3. In the subheader, the theme has some options. However I would like to add a different link, example: My Orders. How could I do it? edit the theme file? what would be the file?

1. Will need to see this in action, no idea what your plugin does and how it styles it.
2. You could with a bit of customization. Not sure you need it though.
3. You would copy the theme file to your Child theme and override it there, simply edit that header.php file in your child theme and add your link wherever you need to.

#wrapper{
    display: flex;
    min-height: 100vh;
    flex-direction: column;
}

.content_body{
    flex: 1;   
}

About the shopping cart I think I will leave the default, but from what I saw it is a css that escorts it.

I don’t know what happened, I still haven’t found out, if it was some plugins that injected css and ended up affecting the theme.

Thanks