You see, I want to delete the column in which my cursor is present, but it's nowhere mentioned in the documentation how to do it.
I am using Komodo Edit 8. I even don’t know what it's called -right-column, right-column, markup, etc. This extra space is consuming too much room on my monitor.
Komodo developer here. I'm assuming you are talking about the minimap. You can get rid of this either for the current file alone via menu View → View Minimap or globally via menu Edit → Preferences → Editor → Scrolling → Use the Minimap Scrollbar.
Documentation on the minimap can be found here: http://docs.activestate.com/komodo/8.0/editor.html#Minimap.