Hi there, @drkmkilgore.
Thanks for reaching out to us about the report preferences for QuickBooks Mac 2019.
Most likely your QuickBooks is set to Accrual and reverts when you exit the program or open another company. Let's work together to change the report's default reference to Cash.
That should set the report's accounting basis to cash, @drkmkilgore.
I'm still here to help you more if you have additional questions about reports. Just leave a comment below by clicking the "Reply" button. Have a wonderful day ahead!