I don’t think you understand what I wanted. I do not need full width pages. My problem is with gallery carousel view. When I click on the image in catch gallery, it opens up a carousel view, where the image is displayed sort of in full width. However, it does not occupy the whole display area vertically, as below the image there is a space reserved for the comments (even when comments are disabled). This limits the height of the displayed image and in order to maintain the proportions of the image, also its width. I would like to discard this space for comments, in order to have images displayed larger.
