Hi Maico,
Thank you for using Syncfusion products.
At present, there is no support for your requirement of “Customizing minimum zoom level” in PdfViewer. We have logged a feature request for this and we will implement this feature in any of our upcoming releases. We usually have an interval of at least three months between releases. The feature implementation would also greatly depend on the factors such as product design, code compatibility and complexity.
Best,
Navaneetha Kannan