A few browser troubleshooting steps can help you fix this, atslutsky.
Let's refresh your browser first by clicking the Reload option in the upper left-hand corner. You can also press CTRL+F5 to do this. If the item is still not showing in the Products/Services column, I've got more solutions you can try.
Open your QBO using a private or Incognito window and create the invoice there. If the item shows, go back to your previous browser and clear out the cache. Once done, close and reopen the browser to start a new session with QuickBooks. You can also switch to Google Chrome, Internet Explorer, or Mozilla Firefox to create the invoice.
Please keep me posted with the results. I'll be around to help you more.
Thank you for taking the time to let me know the steps that you've taken to resolve the Product/Services not populating in invoice. I'd be glad to assist you with making the needed invoices and getting you back to business.
Just to confirm, do you see the Expenses item on your List of Products and Services? Additionally, it would be good to search for items that have been made inactive to see if a product or service is sharing the name. Here's how:
Select the Gear icon. Click Products and Services. Select the Funnel icon and change the Status to All.
This will display all of the products and services that are listed in your QuickBooks Online account. If you see that Expenses is there and has been inactive, you can change it to active by selecting Mark active to the right.
The following is a brief video to serve as a visual guide: