In the Online version it will probably show the regular 1040 on the screen but if you print it out or save the pdf it will be the 1040-SR.
The 1040SR is EXACTLY the same as the regular 1040 just larger type so it goes on 3 pages with the Standard Deduction chart on page 4. But it has the same line numbers. You automatically get the SR if you or your spouse is 65 or older. It doesn't matter which one you file.
