Doxygen: how to hide a specific page in treeview

I have a problem that I could not solve myself. Help me please.

I have (conditionally):

/** @mainpage A
@subpage B
*/

/** @page B 
@subpage C
*/

/** @page C */

Doxygen creates a tree where all pages are displayed at the root level.

+ A /
| --- B /
| ------ C
| --- B - WANT TO HIDE
| --- C - WANT TO HIDE

but I need only the top ones (A here and the nested B and C) to be visible, that is, @subpage tags should be organized accordingly.

I also tried setting the visibility to no in DoxygenLayout.xml. But it hides all pages, only “files” and “classes” remain.

Thanx in advance.