Found where I turned that stuff off:
Right click on desktop. Select "Personalize"
In lower left, select "Taskbar and Navigation"
In next window, select the "Navigation" tab.
Change stuff in that tab to suit needs. The only things I have checked are:
"When I sign in or close all apps on a screen, go to the desktop instead of Start"
"List desktop apps first in the Apps view when it's sorted by category"
Not even sure if those two matter, but they are the only two of the 8 main and one sub-main boxes that I have checked.