You cannot permanently delete order history on Amazon
You can archive an order to hide it from your default order list
Sign in to your Amazon account
Go to Your Orders
Find the order you want to hide
Select Archive order
Confirm the action
To view archived orders, go to Account & Lists
Select Your Account
Open Archived Orders
To hide more orders, repeat the archive process for each one
To remove browsing history, go to Browsing History
Select Remove from view for individual items
Select Manage history to clear browsing history if needed