By "turning on HiDPI", I mean having access to a menu such as this https://miro.medium.com/max/3518/1*QXxPDSp60XIZJhz4isSpiw.jp... Without the ability to scale the UI, this is what part of the UI of Xcode looks like on a 4k monitor: https://imgur.com/a/beTxJNG It's unreadable.