If the option to swap is still avaiable to you go to the bottom left of the seller hub page, in the box titled Selling Tools the last option should be to opt out. If it's not there you're stuck with it, I'm afraid, as we all will be sooner or later.
You don't have to use the Overview page. Just use the Orders and Listings tabs and ignore the rest. To make your home page less cluttered go top right to Customise and select the columns of information you want to see on your homepage.
