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The adjustment to schedule E income would normally be an entry made by the taxpayer in a screen entitled Let's cover some uncommon situations, where you would manually enter an adjustment to QBI income. It looks like this in TurboTax:

You see it after you are done entering your rental income and expenses, when you see the QBI questions. The number entered as Adjustments to business income appears on the QBI deductions smart worksheet in line E-2.