Deductions & credits

Thanks! 

1) How do I see a draft of the 1040 in TurboTax so that I can check line 30?

2) We are a married couple with no dependents. I don't have any idea why we only got $600 but clearly we are due a lot more if it's $1400 per person, or $2800 less $600 = $2200.   How are we supposed to get this third stimulus payment corrected if not on the 2020 return? help?