The status bar at the bottom of the Lister is primarily used to display basic statistics about the current folder.
This is an example of the default status bar in a single display Lister. The information presented (from left to right) is:
You can use the Display / Status Bar page in Preferences to configure the information displayed in the status bar. Using the various available status bar codes it is possible to configure some quite complicated status bar displays:
The Separate dual-display status bar option on that Preferences page lets you enable a separate status bar definition whenever the Lister is in dual-display mode. It is possible to configure the status bar to display separate information for the left and right (or top/bottom) file displays, but if you have not done this, the information displayed only pertains to the current source file display.
Some status bar elements will show you more information when you hover over them: