On the bottom of the Bluefish window is the status bar. Shown here are messages, the current line & column number, the insert (INS) or overwrite (OVR) mode for the cursor, and the file type & character encoding.

Figure IV.11. Bluefish Status Bar

The visibility of these items can be toggled via the View menu.

Figure IV.12. Bluefish View Menu

If you want to disable any of these items by default, you can set these options in the preferences under User interface.