Unable to create a new Bookmark root

I'm trying to create a new bookmark root to organize my files for a new project but I'm unable to do so. I'm also slightly confused. Is a bookmark created INSIDE a 3Dspace? or is the bookmark and the 3D space not connected by any means ?

Edu ​​​​​​​3DEXPERIENCE ​​​​​​​3DSpace ​​​​​​​