ISE 3.0 features automatic outlining, so structures like braces can be collapsed or expanded by clicking the small "+" or "-" symbols next to them.
To quickly collapse or expand all outline, press CTRL+M. Collapsing all outlines can be useful to get a quick overview and better display the script structure of long scripts.
You can create your own collapsible regions by using the keywords #region and #endregion. These keywords MUST be lowercase and cannot contain a space between "#" and the keyword:
#region Initialization Stuff $a = 1 $b = 2 #endregion Initialization Stuff
Optionally, you can add a description. To better understand where a region starts and ends, it is recommended to add the same description to both statements.