If I right click on a bookmark, I get a dropdown which includes options to open that bookmark in either a copyholder or a quick reference panel. This is very useful.
However, when the bookmark links to an internal folder, then it seems there is no way to open the files in that folder in either a copyholder or a quick reference panel. There is small arrow which when clicked opens a list of the files, but they can only be opened in the Inspector pane. This list can’t be right-clicked to open a file in a copyholder or a quick reference panel. And when the file is open in the Inspector, there is no option on its right-click menu to open it in another panel either. If I open the folder in another panel, there is no way to access the files it contains.