I went to Amazon, checked out a few items, then closed out the site only to discover that Opera was displaying three new Speed Dials. They were showing the items that I showed interest in on Amazon.
Hovering the 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.