MapInfo Professional ruler tools drops nodes without clicking left mouse button as expected


User running MapInfo Pro 15.2 64-bit is using the Ruler tool but after clicking the left mouse button to start the measurement process, the user notices that multiple nodes are being dropped without the user clicking on the left mouse button, as expected.
The user expected that only when left-clicking on the mouse button would a node be dropped.


The user had clicked on the letter "N" on his keyboard which puts MapInfo Pro in "autonode" mode.
User-added image


UPDATED: April 4, 2017
The user clicked on the letter "N" again to turn off "Autonode".
The status of "autonode" is visible at the bottom of MapInfo Pro - if the word "AUTONODE" is visible, then Autonode is enabled.