Design tab is missing in Sidekick bar and sidekick is empty

I created custom component but sidekick is an empty. It  doesn't show any component in sidekick bar. 

And also design tab (highlighted area in image) is missing. I am getting all other tabs Preview, Edit, Sacffolding,website, refresh.

It is working fine in testing environment  from where i created the packages.

But when deploy to other environment. It doesn't show the design tab (highlighted area in image) and custom components.

It is static website.

What could be an issue ?

Thanks