I am not sure what keyboard combination I pressed to ended up in this mode, How to fix and exit from this mode of selection?
I am not sure what keyboard combination I pressed to ended up in this mode, How to fix and exit from this mode of selection?
You probably entered Column Selection Mode via an accidental click in the editor context menu (at least that happens to me occasionally). To exit the mode again, just right-click in the editor and select Column Selection Mode (which will have a check mark in front of it).