This is a simple process to move from subcategory to the main category.
Please go to Settings > Income or Expenses Category Management
For example, in the Expenses Category Management, you will see the "Social Life" category, and you want to change the "Friends" subcategory to the main category.
1. Please click "Friend" (subcategory)
2. Please tab the "Main Category" button that is on the top-right corner.
3. You can now see “Friends” has become a part of the main categories among your other expenses.