Each time I launch my Quickbooks mac app, it asks me log in, even though the "stay logged in" is checked.

Hi there, marice5.

As part of Intuit's security, the system will ask you to log in once in a while.

Also, if you have some questions in managing your Intuit account, you can check this reference: QuickBooks Q & A.

I'll be around if there's anything that I can help with. Keep safe!