Create a new Window

Do you use a storyboard or not ?

Is it a doc based app (I guess so)

I tested with a storyboard, no doc based:

- created 2 windows in IB

- a button on the view of the firstWindow to segue to second.

And they show in 2 seperate windows.

Can you describe your set up ?

You should try this:

- In IB, select the window of the WindowController

- In Attributes inspector, set tabbing mode to Disallowed.

You should now have new windows in stack.

If doc based, may have a look here:

https://stackoverflow.com/questions/45119813/how-do-i-open-another-window-in-macos-in-swift-with-cocoa

or

h ttps://www.raywenderlich.com/613-windows-and-windowcontroller-tutorial-for-macos

Thanks for you answer it resolved my question.