If I make a Class inactive in QBO does the data stay or disappear?

You won't lose the data associated with an inactive class, cstraley3.

Your data remains, and an inactive class will show as deleted on the report. See the attached screenshot to see the actual information.

If you wish to activate a class, the following steps outlined below will guide you through:

1. Go to Settings, then All lists.
2. Choose Classes.
3. Click the Gear icon, then mark the Include inactive box.
   
4. Locate the class, then click Make active.

I've added this page, Learn how to use classes to track income, expenses, or profitability by business segment for more details.

Let me know if you need anything else about class tracking, and I'm always right here cstraley3 to help.

Thank you! Can you reactivate the Class at some point?