Detecting image only once

Hi there,

I'm a newbie so sorry if the question is too simple J

Is there a way to stop Vuforia in continuously searching for the marker? I want to open the app, detect the marker once, load my model, and then stop the marker detection process. I don't want to lose my model when the marker is not anymore visible. 

I am using the embedded Vuforia in Unity and run tests on Android O.

Any help is appreciated.

Thanks,