This plugin maintains the hierarchical order of categories list in Category tab under your WordPress admin post editor
This Plugin contains functionality to let you maintain default hierarchical order of categories when you select categories for a post.
The selected category/categories for which a post belongs to are by default pushed at top in category tab while saving the post. Whereas activating Categories in Hierarchical Order plugin will remain position of category/categories unchanged as per their parent/child relationship.
For support, use support page available here or visit Categories in Hierarchical Order page