Happy to help get back the QuickBooks theme to white and black, Martin.
It seems that you accidentally turned on the QuickBooks Online dark mode feature. That's why your screen has a black background with white. No worries, I have easy steps to return your preferred screen.
Let's go to your QuickBooks Themes page to switch off the dark mode button. Let me show you how:
If the feature is not turned on, ensure no browser extension that offers dark mode is installed on your computer. This is likely why this mode is always enabled on your end. If installed, we'll want to turn it off by accessing the extensions list in your browser's settings. Each browser is different, so check with their help resources if needed.
Additionally, here's a link that covers all the tasks you can do when using QuickBooks Online:
I'll hear you out if you have concerns about other settings in QuickBooks. I'll also cover other topics if you need help with reports, entries, and lists.
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