Different code has been used at the URL you have shared. Which is impossible to install in an ArileWP pro theme.
You can show the display of the sticky menu according to the ArileWP Pro theme. Because the menu code in the ArileWP pro is different.
And in this, the sticky bar has been prepared according to the code of the ArileWP pro theme. If we will trying to modify the code in the theme according to your requirement, so we need to lots of code customization in the theme.
I hope you understand.
Thanks for your patience.