ZeroApp application does not display pages of additional categories

Hi Balbooa, I have a problem in the ZeroApp admin panel. I added several categories like:
- Main category 1
- Main category 2..
- Sub category 1
- Sub category 2...

If I add a page and assign it to the main category (as default) but I also add an additional subcategory. In the gridbox panel, it is only displayed after clicking the main one in the category list. How to display pages only from additional categories in the panel? Each time you have to remember which one is assigned as the main one.

See the example below:

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