I was looking to change the responsive menu dropdown for mobile phones to a hamburger menu. Is it possible by changing a setting within the Travelify template or will I have to use some custom CSS or use a responsive select plugin?
Hi there
Hope you are having a good day and thank you for your question 
Ups, im sorry but this theme does not support by default hamburger menu on mobile devices 
customization of the template or third party plugins and solutions is necessary to achieve this goal, sorry
Thanks!
Colorlib Support Team