I can share some steps and info to ensure you can get your QuickBooks Online (QBO) app back up and running again, @tsprofiling-work.
There are two scenarios I can think of based on the info you've shared. First, if you're referring to your QBO mobile app, you can clear the app's data to refresh it.
For Android devices, here are the steps how:
If you have an iOS device, the following are the steps to follow:
Once done, please power down and restart your device before re-opening.
Second, if you're using the QBO desktop app, you can also clear its cache to refresh its system. Let me guide you how:
If the issue persists, you can uninstall and then re-install the app. This is to ensure you get its most recent version. For the detailed steps, please see this article: QBO desktop app guide.
In case you have more questions about the QBO mobile app, you can read through this resource for more insights: QBO mobile app FAQs.
To maximize the features of your QBO desktop app and use them to your advantage, you can review this handy article for the various keyboard shortcuts for easy navigation: Different Keyboard shortcut keys for QBO desktop app.
You can count on me if you have more questions about managing your QBO app. Just tag my name in the comment section and I'll get back to you as quickly as I can. Take care and have a good one.