The Content panel takes up the majority of the RouteBuddy Window to the right of the Source List.
It is comprised of two main areas depending on the Source List function selected.

When the mouse is hovering over the Map View Area and you do a right click you are offered a contextual menu.
If you have an feature item (e.g. a route) selected when you right click you will be offered a contextual menu applicable to the feature.

The columns in the Browser View can be reordered by using the flippy triangles at the top of each column, they can also be expanded.
Double click an item in the browser view list and an editor window will open below the map.
The content of the editor window will depend on whether you have double clicked to open a route, track or waypoint.
For more information on the individual editor windows refer to:
If an item (e.g. route, track or waypoint) is highlighted in the Browser View Area a right click of the mouse will present you with the edit options for the type of item highlighted
e.g. for route: