The HotFolder Toolbar offers tools to manipulate HotFolder Tasks. A HotFolder Task is a set of instructions based on a Job that run whenever new files are found on a specified folder. More on HotFolders can be found here.
By default all the created HotFolders are active. If you don't wish for one of them to run select it from the HotFolders Panel and click on the Deactivate button. To activate it again click on the Activate button.