Adding bookmarks to folders

I have just started using Safari after being a Firefox user for years. In Firefox I could hit cmd-D and then select the folder I want to put the bookmark in from the left-hand panel. I have lots of folders and sub-folders. If I want to put the bookmark in a sub-folder then I click on the main folder to open it, then I can click again to close it. All my main folders are visible in one column on the screen as sub-folders are hidden.

However if I do this in Safari, when I click cmd-D every folder and sub-folder is open, so in order to select the correct folder I may have to scroll down and down and down until I find it. This is just ridiculous. Is there no way to close the folders while saving a bookmark?

I can open and close folders when using Safari, so why can't I do that while saving a bookmark?