Hi there, @CS20.

I'm here to share information about saving an inventory item in QuickBooks Desktop (QBDT) Enterprise.

When you save notes to an item, it will automatically save to the Notes section on the Inventory Center. Here’s how to check the item notes:
 

1. Go to the Inventory menu at the top.
2. Select Inventory Center.
3. Choose the inventory item.
4. Click the Notes section at the bottom and the notes will appear.

I've provided a screenshot for reference:

With regards to showing the item notes when editing the item on the Item list is unavailable. I'll feedback this to our Product Engineer to let them know about these ideas so they can put it into consideration for future product updates.

You can check our QuickBooks Blog to know the recent news and updates about QBDT Enterprise.

If you have further questions, please let me know. I'll be happy to help.  Have a good one.