QBI means Qualified Business Income. As it pertains to rental income, your net income or loss is typically QBI if you materially participated in the rental activity. You can use this link to see if your rental activity qualifies as QBI:
https://proconnect.intuit.com/community/business-tax-credits-and-deductions/help/qualified-business-...
The box in TurboTax that you list here that is highlighted in pink, is asking for your 2019 QBI amount. Since your loss was $2,935, that would be the entry for 2019 QBI, assuming your rental activity qualified as a QBI activity for that year.
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