Idle position of PTZ camera

I have a yucvision P2M8 camera, and am using Videolink app. I want the camera to track from a start position and then follow the subject until it has returned past my start position. however the camera does not stay in the start position i have created but moves after a minute back to its own idle position, which is in the middle of its sweep. I can see no way to change this idle position.

I have the answer. Using the VideoLive app, you go to the ptz page and move the camera to the desired start/stop position. you then go to the preset page and put in 88>Set. You then clear the 88 and enter 97>Call. job done.