Hello Barry,

Thank you very much for the details provided.

Based on the information in the question, I managed to reproduce the mismatch between the values of the zoom property of the PDFViewer and the value in the ComboBox displaying the zoom level of the document. After consulting the matter with our team, I can confirm that this is a bug on our side and I would like to apologize for any inconvenience that it might cause.

I logged an issue in our public GitHub repository and what I would suggest is to subscribe to this issue in order to track how the resolution process goes:

https://github.com/telerik/kendo-angular/issues/4037

In the meantime, what I could suggest as a workaround would be for the developer to manually adjust the value of the zoom set to the PDFViewer component and the value that is displayed in the ComboBox: 

https://stackblitz.com/edit/angular-xcz29b-rwbxws

As a token of gratitude for pointing out this issue to us, I updated your Telerik Points.

Let me know if you need additional assistance with this case.

Regards,
Georgi
Progress Telerik