My income through K-1 is from an SSTB. The QBI deduction is automatically being calculated. How do I tell TurboTax not to generate the QBI deduction?

At the end of the K-1 interview entry  section you should have come accross this screen ...

 

even with an SSTB you may get a QBI deduction

example

1) SSTB income  $50,000

2) taxable income $374,800

3) threshold - married filing joint $329,800

4) excess line 2 - 3: $45,000

5) phaseout $100,000

6) lines 4 / 5: .45

7) 1.00 - line 6: .55

😎  line 1 * 7: $27,500

9) qbi .2 * line 7 * line 8: $3,025