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The label used for list items can be customized using the itemProps function. The main use-case for this is to provide a custom label based on the data in the component.

For example, to use the title field as the label for this image gallery collection:

// ...Other fields
{
  label: "Image Gallery",
  name: "gallery",
  type: "object",
  list: true,
  ui: {
    itemProps: (item) => {
      // Field values are accessed by item?.<Field name>
      return { label: item?.title };
    },
  },
  fields: [
    {
      label: "Title",
      name: "title",
      type: "string",
    },
    { label: "Image", name: "image", type: "image" },
    {
      label: "Size",
      name: "size",
      type: "string",
      options: ["sm", "med", "lg", "xl"],
    },
  ],
};

which will render as: List UI with label prop

Although providing a custom label is the most common use-case of itemProps, the className and style props can also be returned to allow custom styling of the list component.

For example:

// ...Other fields
{
  label: "Image Gallery",
  name: "gallery",
  type: "object",
  list: true,
  ui: {
    itemProps: (item) => {
      if (item?.title === "Dog") {
        return { label: item?.title, style: { backgroundColor: "blue" } };
      }
      // Field values are accessed by item?.<Field name>
      return { label: item?.title };
    },
  },
  fields: [
    {
      label: "Title",
      name: "title",
      type: "string",
    },
    { label: "Image", name: "image", type: "image" },
    {
      label: "Size",
      name: "size",
      type: "string",
      options: ["sm", "med", "lg", "xl"],
    },
  ],
}