With some excel documents, GroupDocs Viewer displays it in multiple pages.
Image attached, document sent via email.
Thank you.
Hello Alexis,
Rendering of the Excel documents is a bit different in the HTML and image based modes.
In the HTML-based mode the document is split by layouts and rendered with tabs as in the Microsoft Excel.
In the image-based mode the document is split by printing pages as in the Microsoft Excel and rendered with a scroll bar.
It seems that in your case the image-based mode is enabled. If you want to render document with tabs, please use the .UseHtmlBasedEngine() with the front-end generator (Viewer.ClientCode()).