Thank you for getting back to us, @drylightn. 

Yes, you're right. We used to have the option to switch QuickBooks Online (QBO) to Dark Mode. This is one of the beta features we have for QuickBooks Labs. Recently, we've removed the QuickBooks Labs and this includes the Dark mode and QuickBooks Themes. 

In the meantime, you may consider checking your browser's settings on how to set it up to Dark Mode.

Here's more information on how you can get started and adjust settings after you sign up for QuickBooks Online. It'll guide you in knowing your dashboard and the different views in QBO. 

Let me know if you need more information about the dark mode option in QBO, I'm always here to answer them for you. Have a wonderful day!