If you want to change who recently contacted leads, then you can get a guide here. This may be particularly relevant if you want to move private call back from one phoner to another.

1. Create a filter view of leads you wish to change.

You can find help with the filter view here:
Data Filter
Campaign Filter

2. Access the filter and add the action by selecting:

3. Select action "Edit/move leads", followed by which the topics "Last contacted by" should be and finally "Execute action":

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