Using one of the practice returns, I was able to create vouchers for both states in one return. Those vouchers for both states did appear on the print screen
The things I had to do:
Install each of those states
Make sure that one of those states was indicated as the resident state on screen 1. In my test case, I used OK as the resident state.
Make sure that the other state had some sort of input by going to the State Tab, selecting the Kansas (the nonres or PY return) input for General Information, and I simply entered a "T" for taxpayer in the top box, and OK in the PY resident state box.
Go to the ES input screen and in the lower right quarter of the screen, enter one of the state abbreviations, the "IN" to indicate the estimate is for individual tax, enter the amount for each of the vouchers, THEN
Page down to a 2nd ES screen and repeat the above input for the second state entering all of that similar data.
Calculate or go to Print/View where I was able to see +/or print all 4 vouchers for each of the two states.