How to initially set a value in ng-select?

I have ng-select with list of values. If i click on selected value and click clear , need to set first option .Please help me how to sort it out . https://stackblitz.com/edit/ng-select-wdcg5a?file=app/app.component.ts

<ng-select class="" [items]="assigneeStatus" name="status_filter_id"
bindLabel="lookup_label" bindValue="com_lookup_id" placeholder="Assignee Status"
[(ngModel)]="searchAssigneeObj.status_filter_id" [hideSelected]="true"
#status_filter_id="ngModel">
<ng-template ng-label-tmp let-item="item">
<span>{{item.lookup_label || 'All'}}</span>
</ng-template>
<ng-template ng-option-tmp let-item="item" let-search="searchTerm"
let-index="index">
<span>{{item.lookup_label || ''}}</span>
</ng-template>
</ng-select>

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