Randomly, a few weeks ago when I go to “My Orders” screen on Amazon the option to see “Open Orders” has disappeared. I only see a list of every order, digital orders and canceled orders. Since I order a lot this has effectively made the screen useless. I e-mailed them several times and once I got a response suggesting they were “testing new site features” and other times got unhelpful instructions on how to go to the “My Orders screen”.
Go to the your account page. There is a listing for your open orders. That is where I found mine as I also lost the open order button on the main page.