Need to change a Retroarch setting globally - options?

Hi, I use MuOS on RG35XXSP and I really like it. I am trying to get an option added to the Retroarch Quick Menu to take a screenshot, as I find the default key combination to be quite fiddly. However, the setting for this (User Interface > Menu Item Visibility > Quick Menu > Show ‘Take Screenshot’) is reverted when I exit any game. I have read about the Freedom Mode and Overrides and am still not confident what I need to do. I do understand that I can do the overrides at a core / folder level (i.e., per system) but essentially what I am trying to do is a Global Override, as I want that option to be available irrespective of the system / game. I don’t want to enable Freedom Mode because that seems like an overkill and extra risk for too little gain (I don’t intend to change a lot of settings). Is there any other way to achieve this?

Why not change the screenshot hotkey within General Settings if the default is not your thing?