There are various ways of removing media files from the Media Pool. But please bear in mind, that they can only be removed when they are no longer used by objects within a project.
Right-click the corresponding media file and select Remove.
It may be necessary to remove objects from the timeline that use this file before the media file can actually be removed. To do so right-click the media file and choose Select timeline objects. The objects can now be removed by right-clicking them and selecting Remove.
Several media files can only be removed in one go after selecting them. This is done just like in the Windows Explorer. In addition to this, you will find some other selection functions in the context menu, which appears after right-clicking a media file.
In the main menu, click on Media Pool and select Remove unused files. Following this, all files which are not used by objects are removed and a message is displayed in the preview window, providing information about the number of files removed.
Both methods cause the media files to be removed from the project only; they are not deleted. The files remain on the hard disk and can be used for other projects again.
See also
Converting images into JPG format