I am not filing any SR's either and have the default set. I just transferred a client from 2018 and there is no red check on the 1040/1040SR on the top of the forms in use, however, when I click on it and scroll down, it does allow the box to be checked on the Schedule 1.

I also noticed is states "Entry is required when Schedule 1 is part of the return", so does that imply it is not required for all taxpayers, if no other Schedule 1 reporting is required? Maybe that's why it is not showing up in the Filing copy.

I'm now wondering if it is required for everyone to answer and file with return. I'd call the IRS, but that would just be a waste of time.