Get your taxes done using TurboTax

I now have more information. In order to use "Revert to Saved" and not keep changes from the current session, Mac users can adjust the setting for Autosave as follows:

1. Go to System Settings > Desktop & Dock
2. Scroll down to find the option to disable automatic saving of changes
3. If "Ask to keep changes..." is turned off, turn it on in order to prompt the question (see screenshot below)

With this function turned on, you can make changes you don't intend to keep. 

When you tell TurboTax "File / Close", the option whether to save the changes will appear (see screenshot below):

Choose "Revert Changes" if you don't want to save the changes.

When you reopen the file, the changes from the last session should not appear.

@Fred_R