Display Index in Main Navigation - Bedford

Site URL: https://www.premiumdissertation.co.uk/

I highly do not forget one of the templates allowed the index pages to be displayed as links inside the principal navigation (type of like anchor links where clicking on them scrolled all the way down to the phase), however can not for the life of me figure out how to turn on that function or figure out which template has that characteristic. I'm currently the use of website just like this 

 since it permits an index. The desire to display the index pages in the most important navigation turned into in Site Styles. Can a person please tell me which template it become or how to turn it on? Thank you earlier.