Hi,
You can go to project settings->input and change the default controls to whatever you want. Not sure what is the name for the thumb controller, but you should find it online somewhere.
Hello @ricknoble!
I know that Oculus has its own documentation and mapping for Input, and I think they actually provide most of them in a plugin as well. Here is a snippet on Input mappings to get you started!
The Action and Axis mapping is where the you map inputs, but it might just use inputs directly in blueprint, in which case you need to find the character or character controller, open the blueprints and change it there.