Once you got an IGC track files in the terrain the Animation button becomes active.
Choose a track, move it from the list of tracks to the ones that get displayed.
Press the Animation button
Animation puts a color cone onto the track and in runs on the track in an infinite loop.
You can stop and start and slow down or speed up the cone movement.
If you close the window that controls the animation, the cone disappears.
And you can select another track.

In parallel a smaller window opens showing what the pilot would see at that moment

One can STOP and START the animation. And speed up or slow down.
(Ok, it needs some fine tuning , I reckon it is a gimmick and do not spent too much time on it)