Inactive followers are accounts who you currently follow and haven't tweeted or retweeted since a month or more.

Use this feature to view such accounts who've been inactive since a month, 3 months or more than 6 months and Unfollow or Whitelist them. You also have the option of directly tweeting out to these accounts by using the Reply button.

Where do I find the Inactive Following for my Twitter account?
You'll find your Inactive Following within the Manage tab on Crowdfire. The Manage tab is situated on the top bar (web app) or the bottom bar (phone app)

You can choose from a drop-down menu to see accounts who've been inactive for 1 month, 3 months, or 6 months and above.

You can also sort this list by Oldest or Newest first from the top right.