how to change geofence.polylineDistance ?

Someone can help me to configure the distance inside geofence. what line should I add and in what part ?. I want to change the default value to 5. I am not a programmer
Thank you

It's a configuration parameter. No programming knowledge is required.

Thanks Anton,
Please help me one more time.
Then I have to add this line to traccar.xml

<entry key='geofence.polylineDistance'>5</entry>

that is correct?
Thanks Again

Looks correct.