Code:
<p-inputSwitch [(ngModel)]="isOn" (onChange)="handleChange()" ></p-inputSwitch>
override the styles is works.
:host {
::ng-deep p-inputswitch .p-inputswitch-slider {
border-radius: 30px;
}
::ng-deep p-inputswitch .p-inputswitch-slider::before {
border-radius: 50%;
}
}