Which year are you referring to?  I downloaded 2021 and the 2020 now has puce  or some other background color when I open it.

I don't have a different color either, but I haven't looked in 2021 options to see if I need to check a box. For me same color for all years is fine

Yeah, I tend to look at my paper file rather  than the prior year program so I have never had an issue with getting the programs confused.  For the new preparers out there, paper is a substance that allows you to see the printed word without the aid of an electronic device.  I am still proud of my membership in the Luddite Society.

That is what I wanted.  But, I have 2020 and 2021 open, but they are both the same color.  No difference between the two.  I know there must be a box to check, or a flag, but I can't find it.

Look here to see it:

https://proconnect.intuit.com/community/proseries-tax-discussions/discussion/re-proseries-update-for...

Open 2020 program    Tools>Options>General   under Field Navigation  check box for Show Previous Tax Year Color