The Checklist app is very flexible and gives administrators the ability to display checklists in various ways. Depending on how Checklist has been set up for you, as well as where in Jira you are viewing a checklist, you may notice some display variations.
When you are viewing checklists on the Issues page in Jira, they can be shown in several places. Administrators can choose from the following Display Mode settings, which cause checklists to appear in different locations and behave slightly differently:
Custom field: Behaves like any custom field in Jira, meaning that it must be clicked before it can be edited.
Some checklists may be configured to only show a certain amount of items before a “show more” link appears, which has to be clicked to display the remaining items. Once it has been expanded, the link will read “show less”.