ghost menu in storefront theme

The menu which appears in the header seems to be untouchable.

I need to control which published pages appear in this menu. But, I can’t. It’s not a real menu, so it does not appear in the menu editor. I have no control over it.

Every published page appears there whether I want it to or not. I have no control over it except to un-publish/draft the page. This is unacceptable.

Also, a pointless “Home” button also appears here. I need to get rid of that, too.

I’d also like to get rid of the “Accounts” feature. I don’t want people making accounts.

…a lot of things to get rid of.