Hi @JFazz,
The option to turn off this feature is currently exclusive to QuickBooks Online (QBO).
What you can do in QuickBooks Desktop for Windows or Mac is to manually update the amounts when creating transactions.
I suggest you keep an eye out for our blog site. It's where you can find Intuit product updates and news. Whenever this feature becomes available, you can be sure that you can find the update from the page I mentioned.
About rounded off figures in transactions, keep this article for future reference: Why do I occasionally notice penny rounding differences?.
Let me know if you have other questions about decimal points in QBDT for Mac. I'll be sure to get back to you.
