Sorry. If you are printing a Form 1040SR it is going to use three pages. You cannot decrease the font size.
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Sorry the larger font is the only difference between 1040 and 1040SR. If you are using the Online version you automatically get the 1040SR if you (or spouse) is 65 or older. But if you are using the Desktop installed program you can pick which one to print.
FYI - only the data get sent to the IRS, not which form it's on.