@philip max glad the range is holding up for you — that kind of deployment is exactly what the module was built for.
To answer your question directly: TX power management on the MultiNav Pro+ is not automatic by default. The module doesn't do adaptive power control on its own based on link quality — that's something you'd handle in firmware if you want it. What you can do is read RSSI on your end and use that as a feedback signal to step TX power up or down programmatically depending on how strong the link looks at any given moment.
The good news is the AI Firmware Builder in the Dev Hub is actually pretty useful for exactly this kind of thing — if you describe your deployment topology and what you want the power scaling logic to do, it'll generate working firmware you can adapt rather than writing the control loop from scratch. Worth trying before you go deep on it manually.
If you're hitting edge cases where the docs aren't clear, post the specifics here too — there are a few people in this community running similar multi-node outdoor deployments and someone might have already solved the exact thing you're running into.
