Buzz: Product Feedback

With the latest update, I seem to have a new Dashboard tab in the gradebook. 

The top-left area of the gradebook actually has most of this dashboard information already. So for me, it's not helpful. And it takes one more click to get to the gradebook. 

How can I remove this Dashboard tab? 

Also, we don't use a few of the other tabs - can we remove them? 

Thanks.