We're on Lunar New Year holiday (Feb 12, 2018 - Feb 21, 2018).  During this time, the support will be limited, the simple question will be answered but the technical issues will be delay after the holiday. We are very sorry about this inconvenience.

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How to active scrolling down/ sticky menu?

You can easily active sticky menu: 

Go to Mega Main Menu -> General -> Layout Options:   primary -> Sticky option: