Camera settings for selfie stick

Deskin

Hi I have a strange issue with my new Z. When I connect my stick via BT the first picture is taken OK, but on the second button press the camera opens settings menu on the screen. The picture is taken but settings menu apears every time. I have tested this with Camera FV-5 app where there is a setting for the volum up button and the stick works fine. My question is where can I find the settings for volume up/down buttons for UMI default camera app? Thank you