It appears to be possible to create estimates as drafts. What I have yet to figure out yet is what incantations must be performed in order to view or find any hint of that stuff anywhere. 

As a general usability feedback for Quickbooks I'd recommend placing functions belonging to the same feature set somewhere within the same vicinity of each other. For example, if there is an ability to create invoices then somewhere nearby there should be an option to view those invoices. 

While I do enjoy the rube goldberg puzzle design of your software and get that it's profitable for the accounting and tax prep industries, sometimes I just need to be able to get my client an estimate they're waiting on without the necessity of 90 minutes of research into what incantations must be performed to do the thing all other software just does. 

For example, when I click "post" below, this forum will take me to the page where my post is. When I click "save" on an invoice in my other accounting app it takes me to a list of said invoices. Quickbooks disappears your work and tells you to upgrade.