Work in the Trim Monitor
The Trim Monitor displays clip In and Out points at a cut so that you can see precisely which frames you are cutting. The left monitor shows the clip to the left of the edit point, and the right monitor shows the clip to the right of the cut.
Open or close the Trim Monitor
- To open the Trim Monitor,
click the Trim button
at
the bottom of Program Monitor, or select Window > Trim Monitor. - To close the Trim Monitor, click the close box
of
the Trim Monitor.
Display the edit point you want to trim
- Select the target tracks by clicking near the track names in the track header area in the Timeline panel.
-
In
the Trim Monitor, click the Go To Previous Edit Point
or
Go To Next Edit Point 
button.
The frames on either side of the new edit point position appear in
the Trim Monitor.
Preview the edit in the Trim Monitor
- To preview the edit once,
click the Play Edit button
. - To preview the edit repeatedly, click the Loop button
.
Press Ctrl+Z (Windows) or Command+Z
(Mac OS), or use the History palette.
or
the Multiple‑Frame Trim‑out button 
.