macOS10.14 在打开应用是总是自动的固定，怎么取消

更新了macOS到最新的Mojave，但是在打开以前没有固定到dock的应用时，总是自动的固定到dock（在下载区的左侧会新加一个区域），这个可以取消吗，（因 为有些应用不想一直展示在dock上，不是很常用），还是说不可以关闭，新系统就是这样，求解答，谢谢大家

Updated macOS to the latest Mojave, but always automatically fixed to dock when you open an application that wasn't previously fixed to dock (a new area is added to the left of the download area). Can this be cancelled (because some applications don't want to be displayed on the dock all the time, it's not very common), or can't be closed, please tell me why. Thank you.