Being a Mac user since 1988, I am used to seeing several Finder windows open and dragging files between them. With the update to Catalina, switching to the Finder will only shown one window, regardless of the number of previously opened windows. Every time I now have to use the menu command to show all windows. That is slowing me down and a poor UI choice.
Now I wonder why there is no setting to show all windows per default. Note this question is not for a keyboard shortcut to show all windows (like in this answer) but for setting the Finder default to the correct behavior. Show all windows, right after command-tabbing to the Finder.