In the QuickBooks sole trader/preneur mobile app, you can create products and services, but you can't view the full list. To access it, you need to log in through a browser.
Please note that you generally can't permanently delete a product or service if it has already been used in a transaction (such as an invoice or sale). Instead, you will make them Inactive to clean up your list.
Here's how:
Go to the Get paid.
Select Products and services.
Locate the products you want to make inactive.
In the Action column, click the drop-down arrow and choose Make inactive to confirm.