Hi Henny
Our more modern templates including Riley only have a single option for the mobile menu. Some of our older templates have 2 options however the options available are somewhat limited (eg. parent items cant be links) which is why we switched to a single more versatile option in our newer templates.
There is a number of mobile menu extensions available if you are seeking an alternative option (eg.
https://extensions.joomla.org/extension/jf-mobile-menu/)
Ciaran