How to change the number of displayed items in a catalog in drupal?

Question

Drupal

Hello.
Made a catalog according to this manual.
The structure is as follows:

-Категория 1
-Категория 2
-Категория 3
-Категория 4
--Подкатегория 4.1
--Подкатегория 4.2
--...
--Подкатегория 4.11

The problem is that on the "Categories 4" page, only 10 elements are displayed on the first page, and the 11th on the second (pagination appears from the bottom), although in all the views used, I turned on "show all elements".
Tell me please, what could be the problem?