Content Dimension Selector missing


I’ve just installed Neos 2.0.x and setup the Neos Demo Site.
According to this screenshot in the newssection there should be some kind of dropdown to select the edited language, but i can’t find it.

Is there anything i need to enable / configure first?


OK. At first I installed Neos by extracting the ZIP-file - Content Dimension Selector was missing.
Now I deleted everything and installed from composer - Content Dimension Selector is there.