Hi Toan Bui,
Greetings from Syncfusion support.
Based on your query you want to remove the search icon placed in the toolbar search input element. You can achieve your requirement by using following CSS Classes.
[app.component.css]
// hide the toolbar search icon
.e-grid .e-toolbar .e-search-icon {
display: none;
}
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Find the below sample for your reference.
Please get back to us if you need further assistance with this.
Regards,
Rajapandiyan S