If you want to cancel a future run, you can go to the Schedule page, select the day and skip the user programs. For Smart schedules, it does not make a lot of sense to skip a certain run because that will only push the run later in the day as the system is trying to maintain the moisture level.
Netro's algorithm encourages longer water time and less water frequency, which will help growth of the roots. It will also break long water time to several small slots to prevent water runoff. If you think the smart schedules water too much , you can either change to different smart zone mode (ECO), or you can set up your own programs and set up your smart zone in basic level. Please check this article for more info. https://netrohome.com/forum/posts/111