Menu does not display when using mobile browser

Hi Experts,

Can anyone have experience this scenario where when i use mobile browser i did not see my list of menu but when i'm on desktop mode i can view the menu list.

Desktop Mode

Mobile Mode


Usually in mobile the menu become the three lines at the top right corner... 

It does not appear? 

In SilkUI and OutSystems Ui themes this happens automatically. 

Did you mess withe the styles or layout?