Hi, I am using the GroupDocs UI .NET repo to view files in my project. When it comes to viewing excel files, viewer cannot zoom in or zoom out in UI. I tried to upgrade packages and tried it in your demo project in github and this issue seems to remain.
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this is the demo i used: GitHub - groupdocs-viewer/GroupDocs.Viewer-for-.NET-UI: UI - User Interface for GroupDocs.Viewer for .NET document viewer and automation API.
Hope you can help.