I'm pretty sure it existed a couple of years ago because I think I've seen other questions about it in this community forum from earlier years. But yes, it's baffling that they include it when it doesn't work. I took hours trying to figure it out because I thought the problem had to be me - how could this major, established software company have such a bad fail in their software? But as you can see from my earlier comment, not only does it not work, but their own people don't understand it.
What worked for me was to enter everything for a joint return, then save a duplicate of that and delete everything related to my wife so that a version was only me, but then I couldn't do the same for my wife because my name was listed first, so I had to re-enter her (luckily much simpler) data into a new return. Then we did a comparison and reconciliation.
Hopefully this will be fixed by next year.
