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prefixOptions.separatorBoolean(default: true)

If set to false, the prefix adornment will not have a separator.

Example - specify prefix adornment separator 

<input id="prefix" />
<script>
  $("#prefix").kendoComboBox({
    label: "Combobox",
    dataSource: [1, 2],
    prefixOptions: {
      template: () => `${kendo.ui.icon("search")}`,
      separator: false
    }
  })
</script>
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prefixOptions.separator
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