Apex admin template manages its layout configuration from single file config.service.ts. This file you can find at src\app\shared\services\config.service.ts

Configuration Options

        setConfigValue() {
            this.templateConf = {

              layout: {
                variant: "Light",                   // options: Dark, Light & Transparent
                menuPosition: "Side",              // options: Side, Top
                customizer: {
                    hidden: true               // options: true, false
                };
                navbar: {
                  type: 'Static'                     // options: Static & Fixed
                }
                sidebar: { // Options for Vertical Side menu
                    collapsed: false,            // options: true, false
                    size: "sidebar-md",                   // Options: 'sidebar-lg', 'sidebar-md', 'sidebar-sm'
                    backgroundColor: "man-of-steel",        // Options: 'black', 'pomegranate', 'king-yna', 'ibiza-sunset', 'flickr', 'purple-bliss', 'man-of-steel', 'purple-love'

                    /* If you want transparent layout add any of the following mentioned classes to backgroundColor of sidebar option :
                      bg-glass-1, bg-glass-2, bg-glass-3, bg-glass-4, bg-hibiscus, bg-purple-pizzaz, bg-blue-lagoon, bg-electric-viloet, bg-protage, bg-tundora
                    */
                    backgroundImage: true,        // Options: true, false | Set true to show background image
                    backgroundImageURL: "assets/img/sidebar-bg/01.jpg"
                }
            };


            }
        }