Editing composer output: Dialog boxes "setup on child pages" do not go away

Using Concrete / Help
1

In editing composer output:

Dialog boxes “setup on child pages” do not go away, they have to be closed manually and icon active processes in ccm editbar stays visible after closing diaogs.

setup_on_childpages
setup_on_childpages1029×609 48.3 KB

Is that a bug?

Or is it for a reason?

Or ist my setup? (Atomik clone, running 9.3.9 without hicks.)