Puedes crear más de un codespace por repositorio o incluso por rama. Sin embargo, cada cuenta de usuario tiene un límite de 10 codespaces. Si has alcanzado el límite y quieres crear un codespace nuevo, primero debes borrar un codespace.
Note: Only the person who created a codespace can delete it. There is currently no way for organization owners to delete codespaces created within their organization.
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Navigate to the "Your Codespaces" page at github.com/codespaces.
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To the right of the codespace you want to delete, click , then click Delete

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Debajo de "Codespaces", da clic derecho en el codespace que quieras borrar.
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En el menù desplegable, da clic en Borrar codespace.

Para aprender más sobre el CLI de GitHub, consulta la sección "Acerca del CLI de GitHub".
To delete a codespace use the gh codespace delete subcommand and then choose a codespace from the list that's displayed.
gh codespace delete
If you have unsaved changes, you'll be prompted to confirm deletion. You can use the -f flag to force deletion, avoiding this prompt.
For more information about this command, see the CLI de GitHub manual.