https://908labo.com/2018/04/14/os-x-el-capitan%e3%83%ac%e3%83%93%e3%83%a5%e3%83%bc%e3%80%80mission-control%e3%81%ae%e5%a4%89%e6%9b%b4%e7%82%b9%e3%81%a8%e6%96%b0%e6%a9%9f%e8%83%bdsplit-view/