Hmm. Technically, the form isn't blank.

Many of the IRS forms are pre-filled with amounts as limits or as part of the computations. You seem confused over the amount, but it's right there on that line:

"Maximum income for optional methods" and that is $6,560

The form shows the maximum for that specific tax year. Look at the text of line 15:

"Enter the smaller of: two-thirds ( 2/3 ) of gross farm income1 (not less than zero) or $6,560. Also, include
this amount on line 4b above"

Form sections that are not applicable to your specific taxpayer will have pre-filled computation values or limits. What you are seeing is informational for you, visibly. It is used by the software, computationally. Just because that section doesn't apply to your taxpayer this time, the IRS still provides the amounts or values or percentages that are for the tax year.