Breadth over Depth.
Wide top level navigation is better than deeply nested hierachy.
It is easier for users to scan a list of categories than to navigate into
a deep hierarchy.
As a rule of thumb, it is OK for category to have up to 15 subcategories.
Conversely, it is suboptimal to have deep hierarchy where each category has
only 2-4 subcategories.
Drag and Drop.
Edit your category tree by dragging and dropping categories. Dragged category
will become a child of the category it is dropped on.
Here's how this filter might look in standard browser:
Your category currently matches 0 products so there are no
attributes to display here
Click and drag attributes to place them into marked fields.
Now duplicating category subtree…