You should remove a collaborator's access as soon as they no longer need the file or folder that you are sharing with them.

The below gives you instructions on how to remove a collaborator from an individual folder or from all folders that you own.

Note: You can only remove collaborators from folders and files that you own or have Editor permissions on.

 Remove a Collaborator from an individual folder

1. Navigate to the folder or subfolder you want to remove a collaborator from within Box.
2. Click on the button to Change collaborator permission and choose Remove from the menu.

 Remove a Collaborator from all Folders that you own

1. On the sidebar click on the menu item that says, Collaborators.
2. To remove a collaborator from all folders that you own click on the Remove button to the right of the desired person in the list.

Note: for collaborators that are in folders you are not the owner you will get a message when trying to remove them "You can only remove collaborators from folders that you own" and you will not be able to remove them.