prefixOptions.separator Boolean (default: true)

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

Example - specify prefix adornment separator

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