When editing files on a timeline track, sometimes you need to scale the timeline for better viewing the files on the track.
Zoom in or out timeline
Drag the blue arrow icon to zoom out or zoom in the timeline track. When you drag the arrow to the "-" direction, the track will zoom out. And when you drag the arrow icon to the “+” direction, the track will zoom in.
Or directly click one of the following icons:
to shrink the timeline track;
to enlarge the track.
The suitable range of timeline
By clicking the "the suitable range of timeline" button, the timeline will be scaled so that you can view all clips in the timeline tracks.
As shown in the screenshot below, before clicking "the suitable range of timeline" button, not all files can be seen in the track. You have to drag the blue slider in the bottom to navigate to the files at the end.
By clicking the icon as the following arrow shows , all files on the timeline can be seen.