I've got just the steps you're looking for! In order to see 941/944 forms that you've already filed, see below:
Viewing Quarterly/Annual Tax Forms
From QuickBooks Online, navigate to the Taxtab > Payroll Tax section.
If the forms are for the most previous period, click either the Annual Tax or Quarterly Tax links.
Should these forms be from a more prior period, select the View and Print archived forms >> link under the respective section.
This list includes a link to each form you've filed for each respective tax as long as you've been using QBO Payroll.
These steps are also listed in our guide on viewing archived tax forms for your convenience. Now you can see any tax form you've ever reported in QuickBooks at a moment's notice. Please reach out to me here should you need any additional assistance, I want to ensure your success. Thanks for coming to the Community, best wishes.