You can filter by instance name, workflow name and the workflow status, but not by the specific actions in the workflow.

You could add that as a feature request here though: Nintex Ideas

Hi @Marc_Wenning 

Thanks for your reply.

It just that the details can sometimes be overwhelming especially when Loops are involved (200-500 plus actions).

The ability to Filter the NAC Instance Details allows Developers to quickly focus on a few key actions and their details. This is great feature to have during the development and testing phase.
  

I’ve already submitted the idea. 

Add feature to filter the activities from a single workflow Instance| Nintex Ideas

Members of the Community, please help to up vote this idea. Thanks