Expenses categories have disappeared

Let's resolve the error you're having to categorise your transactions successfully from the app, @jkjeetley.

First, make sure to use the latest version of the QuickBooks Online (QBO) mobile app. Try to check if you can now locate and categorise your transactions. If it's still missing or you already have the latest app, clear your app cache. 

The piled-up cache in your application caused this unusual behaviour. Clear your data or cache for this app on your mobile phone to reset the app to its default state.

Here's how to clear app cache or data storage if you're using an android:

1. Open your phone's settings app.
2. Look for the QBO app.
3. Tap the clear data or the clear cache option. 

For IOS:

1. Open Settings swipe down and tap Safari.
2. Swipe down again and select Clear History and Website Data, click it once again to confirm.

Refer to this article for more information about categorising bank transactions on your iOS or Android device.

You may also consider using bank rules to automatically categorise transactions from your bank. Check out this article for detailed guidance: 

Set up bank rules to categorise online banking transactions in QuickBooks Online.

I'm here anytime you need further help with your bank transactions on your mobile application by leaving a comment below. Take care and have a great rest of the day!