there is no schedule 1 generated in check return

Click Forms, then under it select All to see every possible form.

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I clicked form, it shows 8879, 1040-V, 1040, Sch C, 8995, 8867, 8959, 8960,8585, Statements, Worksheets, 1040-ES, there is no schedule 1.

there was "3. business income, Attach Schedule C" on schedule 1 for year 2019, I guess I can enter 1099 income there

On the left, click Income, then scroll down to Business Income (Sch C).

Or from the list of forms, click Schedule C and click on any of the blue hightlight areas to get started.

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