All ElevenLabs Default voices are automatically available to select from the voice selection menu. They do not need to be added to My Voices. You can use the Default tab in Voices to view all Default Voices.
Default voices will appear at the end of the voice selection menu. You can also search for a specific voice by typing the name in the search box.
If you are using the API, you can find the voice ID for Legacy voices in the Default tab in Voices. Scroll down to the bottom of the page, and click Show legacy voices. You can then click the More actions (three dots) button and select Copy voice ID to copy the Voice ID to your clipboard.
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.