Any section (menu item) can become a landing/slideshow page using overrides. Here's how you do it:
1. In the Admin launch the MEDIA LIBRARY and double click any of your menu items to launch the override settings.
2. To turn a menu item into a slideshow under SETTINGS scroll down to Slideshow and turn it ON.
3. Next open Slideshow Overrides to make override adjustments.
4. The global settings (site-wide) for a slideshow can be found on the LAYOUT panel under LANDING MEDIA so the overrides are to changes something specifically for that section.