Playlist - a tool where you will form the structure of your music track. That is, in this window will formed scenario (verses, choruses, entry, bridges, etc.) by which the program will play the musical parties of your musical track.
When playing video clips, do not forget about such options as:
full screen view (small square in the lower right corner of the player);
playback quality video (all videos 1080 HD): (in the settings - a symbol of the gear - you can vary).
Playlist program Orion 8.5 | How to work with playlists in the music program