Dropdown Menu on 5 to 4

Hello! i m using dawn theme but i have a question how can i change if 5 to 4 item it will show dropdown menu! Can i custom? thx

It is possible to customize, depending on your familiarity with JavaScript. You’ll need to modify this bit of code: Dawn/main.js at 7b823038f338ce5cf719feea1dd4d650c9b22f95 · TryGhost/Dawn · GitHub

thx for reply
i tried change but nothing gonna change so im confused not in this line