To use this command,

  1. Select two edges that meet at the bottom-left corner of a window opening; Selection order is not important.
  2. Click on the ‘Add Locator To Corner’ button, which is found under the ‘NX Window Maker’ section, located under the ‘Basic’ tab in modo’s tools panel.

This command will add, orientate and position a new locator at the point where the two selected edges meet. It is highly specialised towards this single task and will only correctly orientate the locator when the correct edges are chosen.

Below, you'll find two useful videos. The first shows how to use this tool, whereas, the second video explains why I use locators to align the windows and how to manually alignment them (e.g. if you don't use this command), as well as, how to pair your windows to the locators.