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
it.
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
In the Trim Monitor, click the Select
Video Or Audio Track button and select the track you want to edit.
Click
the Go To Previous Edit Point or
Go To Next Edit Point button
until the Trim Monitor displays the frames on either side of the
edit point you want to change.
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 .
Cancel an edit
Press Ctrl+Z (Windows) or Command+Z
(Mac OS), or use the History palette.
Set trim preferences
You can set the number of frames that will
be trimmed when you use the Multiple‑Frame Trim‑in button or
the Multiple‑Frame Trim‑out button .
Choose Edit > Preferences >
Trim (Windows) or Premiere Pro > Preferences > Trim
(Mac OS).
PDF (adobe.com)
at
the bottom of Program Monitor, or select Window > Trim Monitor.
of
the Trim Monitor. 
or
Go To Next Edit Point 
button
until the Trim Monitor displays the frames on either side of the
edit point you want to change.
. 
.
Press Ctrl+Z (Windows) or Command+Z
(Mac OS), or use the History palette.
or
the Multiple‑Frame Trim‑out button 
. 
