You can use this page to test the Theme’s handling of the shortcode, including the columns parameter, from 1 to 9 columns. Themes are only required to support the default setting (3 columns), so this page is entirely optional.
R2F and F2R describe movement relative to the vehicle's front and rear. These illustrations are examples viewed from outside the left side of a van, with the front on the left.
Viewing the right side? Mirror the examples: the front will appear on the right. R2F still means towards the front; F2R still means towards the rear.
You can use this page to test the Theme’s handling of the shortcode, including the columns parameter, from 1 to 9 columns. Themes are only required to support the default setting (3 columns), so this page is entirely optional.