yaris 2019 reverse camera not showing up when in reverse

[termite]

I recently bought a 2019 toyota vitz. It has a reverse camera but does not show up when i am in reverse mode. I have the nszt-w62g navigation menu kit and when i enter the advanced settings in order to setup the reverse camera guidelines it does show up which indicates that the camera is working.
I do not know what to do in order to make it work in reverse mode. One more thing i forgot is that the battery died so we had to change it, maybe its because of that so maybe it needs to be configured?