Investors & landlords

First of all there is no Jump To button. There is a Schedule D button. If you click on that yiu are not allowed to enter a loss, nor cay you  enter a sale of stock that occurred before 1/1/19.  after more than two and a half hours on the phone with four different tech support people, I still don’t have an answer. TT tax says it pulls the loss from the previos year’s return. Where is proof of that?  Why is there zero mention of the loss carryover while you’re going through the data entry/responding to questions?