How to add total product quantity in back office order page? 1.7.7.8

[MuniGod]

Hi, I want to ask how can I add total product quantity in BO customer order page and quick view  in PS 1.7.7.8.

I want to add i  quick view and in customer order page. Now showing total different products amount, but if customer buying more than one the same item, it is took to long to count how many total items he bought. In this case showing 140, but customer bought 204 items.

Edited October 17, 2022 by MuniGod (see edit history)