When you click some of the fields or nodes () in the left pane, the right pane displays Writing Systems. Depending on what you clicked in the left pane, the listed writing systems are either the vernacular or the analysis.
Typically, the top item is Default Vernacular or Default Analysis. Then, the name of that default writing system is listed, along with any others.
In this example, Sena is the default vernacular. If you select () Default Vernacular or Sena, you get the same writing system.
If two or more writings are selected ():
You can select () Display Writing System Abbreviations if you want to display abbreviations.
You can click (Move Up) or
(Move Down) to reorder the writing systems.