Where is the script that is responsible for pressing numbers in the game?

Help and Feedback Scripting Support
#1

I want to change something in the script that the developers created, where can I find this script?

I know that it is possible to disable inventory, but I would like to change the order of the icons from the manufacturer

-- LocalScript Code
local StarterGui = game:GetService("StarterGui")
StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.Backpack, false)