The feature does not work for me at all.  I checked the box, as explained, in the 2020 program.  But, my input fields in  2020 and 2021 are both a light yellow.  There is no way to tell from the appearance of the page on screen that I am inputting data in 2020, rather than 2021.  I have rebooted my computer, refreshed my updates, tried opening 2020 before opening 2021, opening 2021 first and then opening the client in 2020, but nothing changes.