Hello Mark, and thank you for posting to our community!
Unfortunately because Purchase Orders are a feature of our paid Inventory Management option, those are only available when you have that turned on for your account. The links below explain how to add that back to your plan if you would like to access and/or export your Purchase Orders.
In regards to your request for a delete button for Products; the reason that we only allow you to mark your products as inactive rather then deleting them from our system is that there may be old order data tied to these SKUs.
If you need to filter your products, we do provide an inactive filter to the left of the Products page which is unchecked by default.
If you have other needs for deleting your products we would love for you to share more information with us.