Hi Juan Jiminez,
Query: When PdfViewer is used inside the SfTabView, the content of the Pdf was displayed in the first tab only and Not displayed in others.
We are able to reproduce the reported issue on our side using the sample you have shared. In the sample, when we set the EnableVirtualization property as false the issue was solved and the contents were displayed properly in SfTabView. So we recommend you to use it by setting EnableVirtualization as false.
If you require EnableVirtualization kindly share the details of the platform in which the issue occurs. Please let us know if you need any other details.
Thanks,
Vijayakumar V