Did you follow steps below?
To delete tracks from a crate or sub-crate, right-click on the track you would like to delete and select
Remove From Crate.
To delete tracks from Engine Prime or an Engine Prime Target device:
- In the track list, click the track you want to delete. To select multiple tracks, press and hold Ctrl
(Windows) or Options (macOS) and click each one. You can also press and hold Shift to select all tracks from
the currently selected one to the one you click.
- Right-click the track(s) and select Remove from Collection in the menu that appears.
Deleting a track from Engine Prime Library or an Engine Prime Target will not delete it from its original location on your computer or USB drive.
Deleting a track from Engine Prime Library will not delete it from an Engine Prime Target—and vice versa.
Deleting a track from an Engine Prime Target on one USB drive will remove it from that Engine Prime Target only. It will not affect an Engine Prime Target on other USB drives.