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# Locking Clips While Trimming

Enable Lock to lock the clip or transition under the cursor to the cursor. Locking clips controls whether the head or tail frames are affected during trimming. This is useful if you want to trim without affecting transitions such as dissolves.

To enable locking:

1. Enable Lock.
2. Perform the trim operation.

   Operation | Result
   --- | ---
   Trim Tail | The tail is locked, so the head of the clip is trimmed.
   Trim Head | The head is locked, so the tail of the clip is trimmed.
   Slide | The segment is slid, but the head and tail are not modified.
   Slide Transition | The transition is slid, but the head and tail of the transition are not modified.
   Slip | No effect.

   The effects of using Lock are also described and illustrated in the trimming operations throughout this chapter.