I believe that the provided information within ticket 1442633 helps to resolve that issue.
Indeed, the Kendo UI for Angular Toolbar exposes an (open) event that is fired each time the overflow button is clicked. That event's behavior can be further prevented by calling eventPreventDefault() on it as demonstrated in the following example:
However, the effect will be that the overflow popup is no longer opened upon clicking the overflow button.
Please let me know in case I can provide any further information on this case. Thank you in advance.
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