When the ampersand ( & ) is displayed using the graphical label control, it is rendered as underscore ( _ ) which is not expected. This behavior occurred when converting a character-based screen to a simple graphical user interface (GUI) that utilizes labels and entry-fields.
ACUCOBOL-GT User Interface Programming
Chapter 5: Control Types Reference > 5.12 Label >
5.12.1 Label: Common Properties
This style suppresses the interpretation of "&" as a key prefix. This is useful in cases where you are assigning user-entered data to a label and want to allow values that include the ampersand ("&") character (such as "AT&T").
Alternatively, and a bit more complicated, the data string can be parsed programmatically and when an ampersand is encountered the string can be modified to add a second ampersand, e.g.:
when the two ampersands are encountered together the runtime will interpret/display this as an ampersand instead of an underscore.
The second option may be of value when specifying NO-KEY-LETTER may not be appropriate ( when the & needs to be displayed as _ ).