Chocolatey GUI, by default, will automatically check for the currently installed packages, and will fetch the first page of results when looking at remote sources, when navigating to a source when the application first loads. However, this functionality can be configured using the Prevent Preload feature, or there can be changes to packages outside of Chocolatey GUI. When these situations occur, you can manually refresh the current list of packages using the following button:

Show where the refresh packages button is located within the User Interface

📝 NOTE

This button exists when looking at both local and remote sources