This information must be out of date. There is no "Categories" section under "Advanced" within "Account and Settings". Where has this option moved to?

Hey there, @sastrup. 

Thanks for following along with the thread and sharing your concerns. 

The option to turn on class tracking hasn't been moved in QuickBooks Online. Let me walk you through some steps with screenshots to reference below. 

1. Click on the Gear Icon. 
2. Choose Account and Settings.
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3. Tap on the Advanced tab from the left pane menu. 
4. Scroll down to the Categories section. 
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From there, you can turn this feature on. You can see additional details about this process in Turn on class tracking in QuickBooks Online. 

Please let me know if you have any questions or concerns. I'm always around to lend a hand. Take care!