Windows 10 comes with some features that try to enhance our windows experience. One of these features is one to automatically select the last printer that you printed to as your new default printer. For a lot of people this feature will be very helpful. However for those who like the old way of the same printer always being default it can be burdensome.
For the first group… enjoy the new feature.
For the second group… there is an easy fix. Open settings and then Devices. You will already be at Printers & Scanners at that point all you need to do is scroll down to the bottom where you will see “Let Windows manage my default printer” Just turn that off then scroll back up and click on the printer you want as default then select it “Set as default”.