Masonry Portfolio Filter – Secondary Categories Not Displayed

Hello Enfold Support Team,

I am currently developing a website using WordPress and the Enfold theme. I am using the Masonry element to display portfolio items, but I have encountered an issue:

The category filter only displays the parent categories of my portfolio entries.
The secondary (child) categories do not appear in the filter, even though they are assigned to portfolio items.
I need the Masonry filter to include both parent and child categories so that users can filter by all available categories.

What I Have Tried So Far:

I checked the portfolio settings and ensured that child categories are assigned correctly.
I regenerated permalinks in Settings > Permalinks.
I tested some custom PHP functions.
I cleared all cache and checked with different browsers.

Question:

Is there a built-in way to ensure that the Masonry filter includes both parent and child categories? If not, could you provide guidance on how to modify the theme’s query or template files to achieve this?

Any help would be greatly appreciated!

Best regards,
Mikel