How Do I Disable Alt-Drag Selection on an NSTextView?

I do not know, and cannot find, the standard technical term for the drag-select functionality when the alt/option button is pressed when hovering over an NSTextView.


When alt is pressed, the crosshair appears and text can be selected/highlighted in columns/vertically, as in Xcode.


I would like to disable this functionality in my NSTextViews, how can I do that please?