The following YouTube video link will show you how to factory default a Caseta dimmer:
https://www.youtube.com/watch?v=foHM...8XfDBovnRHr678.
This is necessary if you plan to take a Caseta dimmer that was once attached to one bridge and attach it to another bridge, or if you've linked too many Pico remotes to the dimmer, and are looking to start over with the dimmer.