how to close a modal stack in IDE?

[Tiemo Hollmann TB]

Hi,

when opening a substack modal in the IDE, how can I close it, if I havn't
yet implemented a close button (there are no controls in the title bar).

Ok on windows I can use Alt + F4, but is this the wanted and only way and
how do I close such a stack on Mac, or is there a rev way to close such a
stack? Just curious, because I have trapped me already some times.

Thanks

Tiemo