After you file

What do I do if I believe that Turbotax is making a mistake on my 2021 tax return? I have not filed yet, but there seems to be a mistake were I added my short and long term capital gains. I added my gains into turbotax correctly, and then my estimated return calculation at the center-top of the screen dropped about 3,000 dollars when it should have only dropped about 620. What do I do?  I have also posted a question to the ttlec.intuit community yesterday after many hours of searching and research to make sure I put all my info in correctly.