Open your log.txt file and check fist few lines of it. If it contains -iidxtdj as an argument, ignore my comment.
but if it doesn't have -iidxtdj, you should do it manually not by spiceconfig
first make a shortcut of spice64, and go for into its property. End of the path, manually add -iidxtdj. It should look something like
`path/to/spice64.exe -iidxtdj`
and keep in mind that upper left text would be still LDJ and that doesn’t mean you’re still in ldj mode. Try pagedown to see if you can toggle the second screen
hope it works