Hrm - how come it says “No Editor”. I’ve never seen that before, and it explains why you can’t find a label. When the storyboard is open it should show you a menu bar, window and view controller. Then you can find a label in the object library and drag it to the view controller’s canvas.
There’s something weird going on with your project - you seem to have a HelloWorldc.xcodeproj inside the project. I wouldn’t surprise me if Xcode refuses to start IB because the project is open twice.
Since this is the hello world project, I’d suggest you start again. Close that project, and start over. Create a new macOS app and go straight to the storyboard. You should be able to see some content then, which will allow you to drag a label on.
sam