All ElevenLabs Default voices are automatically available to select from the voice selection menu. They do not need to be added to My Voices. Default voices will appear at the end of the drop-down list. You can also search for a specific voice by typing the name in the search box, or use the Default tab to view all Default Voices.
If you are using the API, you can find the voice ID for Legacy voices in My Voices. First find the voice in your list of voices, then click View to open the detailed view. Click ID at the bottom of the detailed view to copy the voice ID.
You can also get the voice ID for Default voices by sending a GET request to the List voices endpoint. Please see the API Reference for full details.