You will send all the state forms, schedules and statements. Do not send any worksheets. Some states also require a copy of the federal form 1040... read the filing instructions page for the state.
Log in NOW since the online system will close down for 6 weeks for the change to the 2022 program.
Scroll down and click on 2020 tab and choose the PDF download ...
Unfortunately , The ability to print the "Filing Copy" only, ends when a prior year tax return has been archived in the TTX computers.
Thus, for right now, only 2021 tax returns (for the next ~10-30 days) allow you to pre-select only the required "Filing Copy" sheets.
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When you originally printed a 2020 copy, you might have saved that state "Filing Copy only" PDF file to one of your computers....check there first.
IF you didn't do that, then NOW, you will have to download the full 2020 PDF file, and then open and select the State pages you need.......which ones those are, we can't really tell you
........but it would not include anything labeled as a worksheet (and sometimes those non-needed sheets have "Do Not File" printed on them).
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If you used TTX for your 2021 tax returns....download a "Filing Copy" 2021 PDF file now to your home computer before they archive it too (usually in Nov some time).....that way you will have that minimal-sized copy on your computer, in a labelled directory, for any future needs so that you won't get stuck again with trying to figure out which forms to print.