SMLLC's use Sch C that is included with a 1040, is that what you're asking?

SMLLC's can also be rentals; to generate Sch E, that's Screen 18.

IF, as Lisa commented, it's a Sch C, that's Screen 16.

Then there's the random Farm, Sch F  (that would be Screen 19).

And bonus question of the day - what state?

AND... are we safe assuming this SMLLC didn't elect to be treated as some other kind of taxable entity?

Yes. Here is a helpful link https://proconnect.intuit.com/community/help-articles/help/lacerte-individual-smllc-frequently-asked... AND, surprise, surprise, the links within in it are not broken!

If you have a different state, come back and share that with us.