Why can't I see the option to entere item details on the expense entry pate?

Hi there, 

Glad to have you join the QuickBooks Community. It's vital you're able to access the drop-down list so you can manage your transactions with ease. Rest assured, I'll be happy to point you in the right direction. 

To get started, I suspect you may be experiencing browser-related issues that cause certain functions to cease such as the experience you've described. Clearing cache and cookies helps with fixing most browser issues. You can do this by following the steps in this article: Clear Cache and Cookies. I encourage you to give this a try on your browser when you get a chance. 

Feel free to let me know what happens. I'll be here in case you have other questions.

Navigate to the account settings "gear" in the top right of the page, and select "Account and Settings" under "Your Company" then select "Expenses" on the left menu, and make sure "Show Items Table on expense and purchase forms" is set to "On"