When I low power parking mode, if the camera detects an event (sometimes from strong wind or a passing vehicle), the camera wakes back up for usually 1-2 minutes to record the event and backup to the cloud storage (if you have cloud storage option).
But the fact that the camera wakes back up, means it reconnects to the Cloud for LTE, so it will update the settings you requested previously.
So if you've accidentally set it to low power parking mode, but you actually want to keep checking in the vehicle remotely, you can change the settings in the app, and next time it picks up a random event (hopefully not an actual crash) it will connect to cloud and update you settings
If you kept it in low power parking mode, it will go back to sleep after the event passes in usually 1-2 minutes.
So you don't need to restart the ignition of the car for it to update or change settings, it just needs an event to trigger it to wake up temporarily.