Xcode 11 how to use editor and assistant editor

Question

In Xcode 10 I used the shortcut cmd + alt to open a second editor and cmd + return to close the second one. In Xcode 11 I can open a second editor using cmd + alt but cmd + return is not working. Clicking Show Editor Only isn't working as well.

What am I missing? Thanks

Answer 1

Look 2 menu items further down.

To open and close a second editor you can press ⌃⌥⌘↩