Navigator
The uppermost line of the Trackline panel is a navigator that displays the visible range marker [A], the work area marker [B], and the current frame marker [C] at the scale of the whole composition:
Visible
range
The visible range is the range of frames that are visible in other Trackline lines and the segment area. With the navigator, you can manipulate directly the visible range by dragging the marker [A] by the tips or by the body (in the latter case, the number of visible frames remains the same). The displacements of the visible range marker are constrained by the composition bounds and the actual size of the Trackline window.
Current
frame
The current frame marker [C] is also available for direct manipulation. It allows setting the current frame position within the limits of the entire composition without scrolling the Trackline window.
