Use the Edit Mode options to customize your Maya FBX Plug-in UI preset.
Use this option to lock the group or option so that it appears grayed-out in the UI and cannot be modified.
Use this option to change whether the group or option is expanded (A) or collapsed (B) by default in the UI.
View as expandable group/View as expanded Panel
Use this option to set whether a group is expandable (A) or not (B).