Confirmation Preferences
To set your confirmation preferences, click 
> Edit > Preferences. The Preferences window opens, and then click the Confirmation tab. Available options are as follows:
- Always prompt me when TV format conflicts: select this option to enable a warning message when you add a video clip to the workspace whose TV format (NTSC/PAL) conflicts with that of the video clips already located in the editing workspace.
- Always prompt me when aspect ratio conflicts: select this option to enable a warning message when you add a video clip to the workspace whose aspect conflicts with that of the project.
- Enable file deletion from hard drive: select this option if you would like to enable the deletion of files from your hard drive from within the media library.
- Enable warning when chapters are removed during editing: select this option to enable a warning message if chapter points are deleted during video editing.
- Always prompt me when widescreen is not supported: select this option if you would like to be prompted when a widescreen format is not supported.