Unable to access scrivener documents

As in the title, I have the whole text divided into three parts and there are twenty-something documents in each part - each folder. What I can access is just the current document, not any other document. When I click one in the binder nothing happenes, it does not open. When I compile the whole text everything is there, but the fact that I cannot access documents, split them or join them makes me crazy. Help, please?

Do you have your main editor locked? The editor header bar will be a reddish colour if it is, but you can also double-check by clicking on the header bar icon and making sure there is no checkmark beside Lock in Place (Opt-Cmd-L is used to toggle this state from the keyboard).