prefixOptions.separator Boolean (default: true)

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

Example - specify prefix adornment separator

<input id="maskedtextbox" />
<script>
    $("#maskedtextbox").kendoMaskedTextBox({
        mask: "000000",
        prefixOptions: {
            template: () => `${kendo.ui.icon("search")}`,
            separator: false
        }
    })
</script>