Sidebar not working

Hi

Why does module position Sidebar not work ?

Hi, because it's "specific" template not for all purposes. Here is quote from GK developer

This template uses 3 page suffixes:

* no-full-width - disables the full width mode for a specific page (useful in example for a standard portfolio view for a category).

* full-width - enables the full width mode for a specific page (if the specific page doesn’t support the full-width layout by default).

* narrow-width - creates a more narrow version of the page

Some pages like com_content, com_k2 subpages are full width by default. Additionally on the some subpages like single item pages the breadcrumb and sidebar module positions are not available