How to update the icons for primary entities ? (2024 R2)

I would like to update the icons in the Administration > Customisation screen below : 



How can I update them so they use the new "green" style icons ? Also what do I need to do to make sure they are used on the recent list ? Currently I have a mishmash of old and new style icons and I would like our upgrade system to use the new style icons to make it look smart!


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