Total Quantity ok Invoices when using custom themes

Hello I have been using manager for about 6 years now. I know that total Quantity on invoices was added some months back. Please how can I get the total Quantity to work in my case while I am using a custom themes?

start from https://www.manager.io/guides/inventory-items and use all links provided.

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I have gone through but it still doesn’t answer my question

Maybe this

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Good something like this. Thanks