Cross Project Releases - Mark as released

[Nicola J]

I'm 'experimenting' with a cross-project release to track work planned across a range of things. 

I've got a cross-project release set in Roadmaps and now want to mark that (& therefore all the linked releases) as released but I can't work out how to do this in a way that doesn't involve going into each project and manually doing so. 

Is this the case or am I just being dumb? The end date of the release has yet to be met but I'm planning for when it does...