Hello Sergei,

Thank you very much for the details provided.

I will address the requests in numerical order so that it is easier for you to keep track of the response.

1. Programmatic Control

Generally speaking, the Notification, and more precisely the NotificationRef interface that holds the references to the object instance of the Notification, provides a designated built-in hide() method that hides and destroys the Notification:

https://www.telerik.com/kendo-angular-ui/components/notification/api/NotificationRef/#toc-hide

This means that the developer can store all instances of the Notification in an array(or other collection) and use this collection together with the hide() method to programmatically hide the desired components.

To better illustrate this approach, I am sending you a StackBlitz demo that implements it:

https://stackblitz.com/edit/angular-hnzsje-zwasgv

Please, keep in mind that the demo aims to point the developer in the right direction but might need some additional customizations in order to comply with the case-specific requirements which are considered the developer's effort.

2. Global Limit

One possible approach to set a global limit for the number of Notifications rendered on the page would be for the developer to store the count of the currently opened components and manually prevent the creation of new ones if this count exceeds the desired limit. To ensure that the count is updated once a Notification is being closed, the developer can subscribe to the afterHide observable:

https://www.telerik.com/kendo-angular-ui/components/notification/api/NotificationRef/#toc-afterhide

if (this.counter < this.limit) {
      this.counter++;
      this.notificationRef = this.notificationService.show({
        content: 'Your data has been saved. Time for tea!',
        ...
      });

      this.notificationRef.afterHide.subscribe(() => {
        this.counter--;
      });
}

For your convenience, here is a StackBlitz demo showcasing such an approach:

https://stackblitz.com/edit/angular-hnzsje

I hope the provided information helps. Please, let me know if I am missing out on something.

Regards,
Georgi
Progress Telerik