Ugh! V5 firmware. Anyway, I don't think there are any settings that you can change that alter the length of the clip in Hik-Connect. Mine are 15 seconds long which does match 5 seconds pre alarm plus 10 seconds post alarm; however I've seen several posts where people have complained the clips are too long. Just for giggles, try changing the 'max pre record time' to 5 seconds (perhaps the code doesn't like a 0 value)