prefixOptions.separator Boolean (default: true)

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

Example - specify prefix adornment separator

<input id="prefix" />
<script>
    $("#prefix").kendoMultiSelect({
        label: "MultiSelect",
        dataTextField: "text",
        dataValueField: "value",
        dataSource: {
                data:  [
                        { text: "Apples", value: "1" },
                        { text: "Oranges", value: "2" }
                ]
        },
        prefixOptions: {
            template: () => `${kendo.ui.icon("search")}`,
            separator: false
        }
    })
</script>