I went to Amazon. Checked out a few items. Then closed out the site to only discover that Opera was displaying three new Speed Dials. They were showing the items that I showed interest in on Amazon.
Hovering your mouse over the top right-hand corner of a speed dial gave me the option to "Don't show again". But I wanted it disabled permanently.
In Opera go to the following web page opera://settings/startPage
Look down at the last two settings of the Start page section. Click on the blue switches to turn off the options, "Show Continue Shopping section" and "Show Continue on Booking.com section".