The listing of topics shows the potential breadth of information (2 different tabs). They are sorted by topic or by popularity.
By default, you will see only the feeds that cover the current location. To see all available channels, uncheck the corresponding box.
In addition to the compact view, there is a detailed view. There you can filter the list using the filter text field. The filter also includes the (not visible) keywords.
By clicking on the star in the channel title you can favorite this channel and you will get a compact query result on the start page of the program.