As someone who mouses left-handed and uses Numpad 8456, I can sympathize!
The two files you’re looking for are:
- C:\Program Files (x86)\Steam\steamapps\common\Conan Exiles\ConanSandbox\Saved\Config\WindowsNoEditor\Input.ini
- C:\Program Files (x86)\Steam\steamapps\common\Conan Exiles\ConanSandbox\Config\DefaultInput.ini
#1 is your customized keybinds, but occasionally there will be binds that can only be changed by modifying the defaults (#2). Specifically disabling mouse-smoothing, disabling F11 toggling fullscreen, and a few others can only be set in #2.
So your best bet will be to search on not just the letter of the key you hope to change (since that letter will appear in 100s of spots), but rather on the syntax assigning a function to that key. For instance, if Loot All is “F”, then search on “Key=F,” rather than “F”.