Category: User Guide 5.0.0.6x
If your portfolio contains American style options, early exercise is a possibility.
The following diagrams show the opportunities and risks the possibility of early exercise presents: 
  1. The green area represent where early exercise opportunity exists for long positions you hold.  The exercise threshold can be set by adjusting the figure in the "Exercise when ITM by" field.
  2. The red area represents where the short positions can be exercised against you. The exercise threshold assumption can be set by adjusting the figure in the "Get exercised when ITM by" field.

The tick boxes next to the fields allow quick enabling/disabling of the early exercise assumption.

NOTE:   All early exercise related controls remain disabled if no American style option is present in the portfolio.