2.3 Pages

Except the standard WordPress settings for posts, there's also Layouts option box

You can select page  layout - left sidebar, right sidebar, or full-width post, and assign which Sidebar to display on this post view. You can create custom sidebars in Appearance -> Theme Options

Slider Settings

If you'll change Page Template in Page Attributes box to Page Template with HoloSlider you can choose in select box below which slider you want to display