Hello Sudipta,

Based on the provided details it seems you want a thumbnails approach. Could you please confirm this?

If thumbnails is the requested scenario then you can achieve this by using the pdf processing library. Here is a blog post for the scenario: https://www.telerik.com/blogs/turn-pdf-pages-images-pdfprocessing So you can convert the document pages into images. 

Then you can add a CollectionView next to the PdfViewer control to visualize these images in the list control. Kb article can be found here: https://www.telerik.com/maui-ui/documentation/knowledge-base/display-select-pdf-thumbnails-dotnet-maui It shows the scenario when thumbnails are generated for multiple documents, in your case you need to implement for one document following the blog post approach. 

Regarding to the topic and subtopic scenario, send an image of the result you want to achieve and explain with more details.

Regarding to the navigation and search option, send images of the exact features you want in the pdf viewer control.

Regards,
Didi
Progress Telerik