Translations:Kdenlive/Manual/Timeline/6/en
3 - Track header. This box shows some options for a track. First is the track name (Main Video Track in the screenshot). That name can be changed by simply clicking in it. Below are icons to 
which will prevent adding clips, removing clips, or moving of clips on the timeline; 
; 
from this track; and, 
allows you to manage the effects applied to the track. Right clicking in the track header will give you a context menu allowing to manage (add / delete) tracks.