Thank you for sharing the detailed steps you have performed to locate the Service Date in creating an invoice in your new QuickBooks App, @timmer1. The information has helped me to have a clearer view of your situation, and I understand how the new update has been challenging for you right now. I am here to assist you with navigating it and provide some troubleshooting steps if needed.
Please know that to successfully find the Service Date option, after you go to the + Add product or service field, you will need to select and tap the item first so the tab you are looking for will show, and enter the information. You can refer to the screenshot below:

However, if these are the steps you have executed, let us perform some basic mobile app troubleshooting steps to start up the application and remove some historical data that is causing the issue.
To begin, let us uninstall and reinstall the application. Then, log in to your account and check the invoice Service Date option.
If the issue persists, clear up data of the software data on your device. Here's how for iOS:
- Go to Settings, then tap General.
- Choose iPhone Storage, then press the QuickBooks Online app.
- Tap Offload App. This will free up the storage without deleting your app's documents and data.
Feel free to follow the steps below if your device is an Android:
- Go to Menu ☰, then tap More Options ⋮.
- Select Settings, then Refresh Data.
- Click YES to confirm.
In the meantime, create an invoice and add the Service Date information by signing in to your QuickBooks account via a web browser. This will ensure that all transactions are up-to-date.
Specifying the Service Date information in every invoice you create is essential in making sure that we are updated when a particular product or service is or will be incurred and offered for accurate business sales tracking. For additional questions about generating an invoice, especially regarding missing fields, never hesitate to leave a comment below.