Xcode 11 Won't Open New Editor Pane
Ok, this is embarrassing. I was in a 'focus' mode and could only add editors after I had 'hidden focus'. There are a few ways to do this:
- View > Editor > Hide Focus
- Tap the 'arrows pointing at each other' icon in the top left of the editor toolbar
- ^⇧⌘↩︎
ps. I was seriously tempted to delete my question when I realised how dumb I'd been, but I'm leaving it up as I suspect this UI quirk might also trip up others (let me know if it does, it'll help me feel like less of a fool)