The annoying toolbar you're describing is called the Java Editor Breadcrumb (see Eclipse documentation )
It can be disabled by pressing Ctrl + 3 and toggling Java Editor Breadcrumb
That's the breadcrumb bar. It shows the details of the location of the class you're currently editing. It's useful to quickly see if you're editing the correct class, and you can use it to navigate to other locations in your project as well.
If you want to turn it off click this button in the toolbar:
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