OVERRIDE is greyed out in Edit and CANNOT enter data in Line 8 of Schedule 1

Regarding the New Exclusion of $10,200 of Unemployment Compensation OVERRIDE does not work. 

I cannot enter  "UCE" on the dotted line next to line 8, nor input the $10,200 value on line 8.

Per IRS instructions below

https://www.irs.gov/faqs/irs-procedures/forms-publications/new-exclusion-of-up-to-10200-of-unemploym...

1. I select OPEN FORM
2. I select from the side bar Schedule 1
3. Form appears and I cursor over to the dotted line on Line 8.
4. I Left click the area to edit, high lited boxes appear, right click and am unable to enter any data. 
5. I Double click Schedule 1 on the side bar and an alternate Schedule 1 Form is displayed
6. I cursor to EDIT on top tool bar and Drop Down appears
7. Drop down choices are ALL greyed out INCLUDING OVERRIDE except "Copy" and "Emogi & Symbols"
8. I need to edit the fields so I can complete my return

I am using Turbo Tax Deluxe 2020 Disc version on my Mac