Enable additional settings in the Hierarchical table layout for more customization options.
Hierarchical table layouts that you create use optimized code by default. Optimized code improves client-side performance, especially on mobile devices, but does not support all table configurations. To access all settings, revert the Hierarchical table to the previous markup.
In the Section form, select the table that you want to edit, and then click the View properties icon.
In the Layout properties window, for the Use legacy markup parameter, select the Allow check box.