Arrow Key Exploration in Disk Browser

I’d like to be able to use the keyboards arrow keys to explore my comps file hierarchy, where as Left Arrow Key (LAK) goes up and the Right Arrow Key (RAK) goes into the file and the Up and Down Arrow Keys (UAK, DAK) act as they do at the moment when the Disk Browser is Highlighted by the Middle Mouse Button (MMB)

That’s how it already works.

The left and right arrows don’t on mine; is there an option for it somewhere?

@Floss_Daily, Left and Right are currently set to collape and expand folders, but for Mac, the bindings for what you’re looking for are Cmd-Left and -Right (probably ctrl-L and R on Linux/Windows?)

You could swap out those key-bindings in your preferences → keys