Wings in the MAtricks separate the selection into the number of wings set and select devices from each wing from opposite directions.

It is better explained with examples.

Example - Ten Fixtures One Axis

In this example, there are ten fixtures (1 through 10).

They are selected from 1 to 10 without any specific grid information. Highlight is activated.

Since there is no grid information, the fixtures are only on one axis - the X-axis.

Press Next to make the MAtricks X value 1.  

Ten fixtures with MAtricks X at 1 - No XWings

Now tap + in the XWings in the MAtricks window to set the value to two.

Ten fixtures with MAtricks X at 1 - XWings at 2

Now it looks like this

The selection is split into two wings, and each end of the selection is currently On.

Tap +  to change the X number and move the highlighted selection towards the "center" of the selection. Tap - to change the X number and move the highlighted selection from the inside out of the selection. Using Next and Prev does the same.

Tap the video below to see the example.