You can use the
slide_level option to specify which level of heading will be used to denote individual slides. If
slide_level is 2 (the default), a two-dimensional layout will be produced, with level-1 headers building horizontally and level-2 headers building vertically. For example:
# Horizontal Slide 1 ## Vertical Slide 1 ## Vertical Slide 2 # Horizontal Slide 2
With this layout, horizontal navigation will proceed directly from “Horizontal Slide 1” to “Horizontal Slide 2,” with vertical navigation to “Vertical Slide 1” (and then “Vertical Slide 2,” etc.) presented as an option on “Horizontal Slide 1.” See Figure 8.1 for an example (note the arrows at the bottom right on the slides).