Disable certain features of the UI such as item caching or annotation tools.
Hide certain parts of the UI, such as annotation tools or the download button.
Change the theme
Change the appearance of the UI.
PDF.js Express Web Viewer
PDF.js Express is a commercial PDF web viewer that wraps around the PDF.js open-source rendering engine.
The WebViewer instance is an object that contains functions and namespaces for interacting with the UI and document.