When working in a task within a Managed Service extension, context-specific language reference set acceptability entries can be enabled in Concept Editor within the Edit Panel, by selecting from a list of those available in the author's Settings and Preferences.
From the Task View, press the cogwheel
icon in the upper right of the page header, to open the Settings and Preferences pop-up dialogue.When context-specific language reference sets are available, they are listed above the Page Layout section. Each entry has a checkbox to enable display of those entries in the Concept Editor.