Recyclerview collapse mode : Unwanted negative space

[jatin-lakhani]

ExpandableLinearLayout within recyclerview is taking unwanted extra space in the list.
It should hide that space when it is collapsed and again should be visible when we expand it.

Right now the space is occupied all the time
so please provide me suggestion or solution so I can remove this space.
I've used recyclerview within nestedscrollview.

Thanks in advance

This is collapse mode screenshot...

This is expanded mode screenshot...

[albo1337]

dito