After reviewing the return, I made a change, but it doesn't reflect in the return. How can I update the return so it reflects the change on Federal Schedule 1?

Have you already efiled? 

I hope you had not already filed when you made the change, and that you were correcting things prior to filing.  I will assume you had not yet actually efiled when you made the change.  If you had already efiled and then made a change, you should not be making changes that way to a filed return.

Where did you try to view/print?  Was that at the Tax Home?   After making a change in the return, it can take a while for any PDF downloaded at the Tax Home to also update.  You can get the current PDF by going back into the return and printing at the Print Center.   Do you know how to get back into the return interview?   I assume you do if you made a change.

If your return interview is closed because TurboTax thinks you were finished, here's how to open it up to get to the Print Center:

NOTE:  When you open your return back up, do not make any changes in it if it's already been filed.  If you later have to amend the return, it has to start off exactly as it was when it was originally filed.  If it hasn't been filed, you can make all the changes you want.

• Log in, and if your return interview is still open, continue the return to fully open it up.  If the return is closed because TurboTax thinks you were finished, at the Tax Home or in the section "Your Tax Returns & Documents" for 2020, look for a link "Add a State."
• Click on "Add a State."  (you don't really add one.  That's just to open your return back up.)
• After the return is open, click in the left menu column on TAX TOOLS, then PRINT CENTER.
• Then choose "Print, save, view this year's return."
• The next screen should offer some options:  "Just my tax returns", or "include government worksheets (optional)", or "include government and TurboTax worksheets (optional.)"
• See if one of those PDFs has what you need.  The latter has the most pages.

NOTE:  Remember all PDF tax documents and tax data files are very sensitive files, since they contain your personal ID info, financial data, and possibly bank account numbers, etc.  Be sure to store them safely and securely to guard against computer theft, hacking, etc.