Why doesn't Dark Mode work correctlly over the whole site.

Hello there, @james36.

I understand your current situation and how having the Dark mode apply to the whole website can be more helpful in improving your productivity. What I can do is I can help you send a feature request to our Product Development Team. This way, when they see your suggestion, they'll evaluate it and consider it for future program updates. I'll write down the steps below to get you going:

1. Access your QuickBooks Online company.
2. On the top right-corner, click the Gear icon.
3. Select Feedback and then enter your comments or product suggestions.
4. Once ready, click Next to submit feedback.

Furthermore, I've got this article to help you manage your company's current settings: Get started and adjust settings after you sign up for QuickBooks Online.

@james36m, if there's anything else that you'd like me to assist you with or a task to accomplish inside QuickBooks. Please don't hesitate to mention my name in the comment section below. I'll make sure to get back to you as soon as possible.