No access to content actions in collaborative Space in 3DSpace

Hi Everyone,

I am curious why I do not have the full options in my collaborative space (Picture 1). I am trying to move the Assemblies from Horyzn Test to Mission Pulse - Frankenstein 2. However the Help Guideline says, that it should be simply done through the options given (Picture 2), which are not available to me.

Thank you in advance!

Edu 3DSpace​​​​​​​​​​​​​​