https://www.ibm.com/support/knowledg...cmstchoice.htm

The choice text for all choices within a selection field must fit on the display for the smallest display size specified in the file. Therefore, the maximum length for the choice text depends on the following items:

  • The position of the selection field
  • The length of the longest choice number that is displayed to the left of the choice
  • The length of the choice text itself
  • The number of columns in the selection field
  • The width of the gutter between columns