Hide stacks to users

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Hi,
I've ben watching the video about the 5.6 new permission settings, quite impressive I must admit.
The only thing is that I could not work out how to hide a stack from the stacks list for a certain user group.
As far as blocks are concerned it is ok, because there is a "details" tab that allows you to choose which blocks can be added or not , but this option is not available for stacks ... How does that work for stacks ?
Many thanks

 
A3020 replied on at Permalink Reply
A3020
Have you tried setting the permissions via Sitemap -> Show System Pages -> Stacks -> Set Permissions?
ptityop replied on at Permalink Reply
I already set the permissions to hide them but it does not seem to be taken into account