No need to worry, Michael.
Accidentally clicking Reset App Data in the QuickBooks Online (QBO) mobile app only clears the app's cache and locally stored data on your device. This action can help fix app-related issues but doesn't delete your actual QBO company data stored in the cloud. Your financial records, transactions, and all other information remain completely intact and safe.
However, you may need to sign back in, since this process removes your saved login session from your device. Simply re-enter your credentials as you normally would. Once logged in, the app will sync with the cloud and allow you to resume your work seamlessly.
I've added this article for guidance on the availability of specific mobile application features on supported devices: Compare mobile app features.
If you have further questions, please don't hesitate to leave a reply in the comment section.
