Hello,

You might look into some different header, that’s why you don’t find that categories element. If you can see the categories inside your header on front view then the categories element must inside your default header. But I’m glad that you managed it and you add it manually and achieve what you want.

So if you want to remove that prior one,You need to edit your homepage,from your very first screenshot it seems that element exist inside your home page, in the very first row.

Best Regards.