Pop-open folders

When I drop a file into a folder in the Binder, the folder unreels itself and opens with all 50 files visible. This is obviously a setting somewhere - is there anywhere to toggle it off?

It will pop open no matter what - that’s built into the OS X outliner/folder system - but you can set it up to close automatically again, by selecting “Collapse auto-expanded outline items after drag and drop” in the Navigation pane of the preferences.

Brilliant, Keith, thanks, that worked.