If you efiled, has your return been accepted? If not yet accepted, it's best to wait until it is, then your return PDF should also have the electronic postmark in it. But the following may explain your current issue:
To get the worksheets and extra pages here's an alternate way to print by opening the filed return back up to print at 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.
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.
How do I access my 2018 Fed Return to print?
If your 2018 returns were prepared in Online TurboTax, log into your account and at the Tax Home scroll down and expand the section "Your Tax Returns & Documents". Choose tax year 2018, and then click "Download/print the PDF". If you can't find your 2018 return there, then you likely have multiple accounts and signed into the wrong one. Many people end up with multiple accounts without realizing it. Here's how to troubleshoot for multiple accounts (User IDs) :
You can have up to 5 accounts that use the same email address for notification purposes. A User ID may be an email address, but it doesn't have to be. It might be only part of an email address, or it can be anything at all.
To get a list of your User IDs and recover account access, you can use the tool at the link below. When using the Account Recovery tool, try using your phone number first. After that, if necessary, then run the tool on your email address(es) you can access.
NOTE: Before running the account recovery tool below, log out of all Intuit accounts including this user forum, or you might end up in a loop. Then clear your browser Internet cache, close your browser, then reopen it, and go to the link below. You may wish to copy this link so you can paste it into the new browser session.
If still no luck after running that on your phone number and email address(es) that you can access, here's another method:
Go back to the tool again, but this time leave the data field blank, and choose the small blue link that says "Try something else", and it will look you up by SSN and other parameters.