when I drag(call) it a module through the test case creation folder it is coming empty module. It is not showing module details.

Created a module in TOSCA with two test steps. However, when I drag(call) it through the test case creation folder it is coming empty module. It is not showing module details.

Ans - 

Select the the Test case folder and Click on F9

Or

1. Click on the test case

2. Go to view tab in the ribbon and make sure you toggle Hide DoNothing or Show DoNothing.