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The Single Select List field allows to enter option names that can be grouped with headings above each group in the entry form. This is ideal when you want users to select information from a drop down list, for example, their city grouped by state, province or county. The result of the selected item will be displayed by default by its option name in the front-end views. The main difference between a Single Select List field and a Multiple Select List field is, that only one option can be chosen from the list for the Multiple Select List field.
When you have the field enabled for the search function, a multiple select list will be shown to the site visitor, to choose multiple options at once, or a single select list to choose only one option.