For clarification, if you want to use vesc tool on a different device you can install the app on a desktop, laptop or different mobile device and connect to your wheel to make (and save) any setting changes.
Connecting the vesc tool app on my desktop directly to my XRV via bluetooth was my solution to being able to use vesc tool on my pc. I did need to be able to connect to my wheel in order to have access to the settings.