Okay after working on this for a couple of days no reading it over and over I got it . Line 3 has your income for the year. Line 18 is asking you how much of line 3 is income made by you between March 27, 2020 and Dec 2020 . I made my calculation by dividing it by 9 and remembering that 2 months of that I was closed due to COVID. I came up with dollar amount entered it and it didn’t change my refund at all. Hope this helps someone. I don’t think the answer is putting nothing nor deleting the schedule form because it will pop back up.
