Yes. FlipperForce comes with a pre-built workflow, but it is fully customizable so you can change the stage names to fit your business. This applies to both the Lead Pipeline and the Active Project Pipeline.
How to rename a stage
Find the three dots at the top right corner of the stage column
Click the icon and select Edit Stage Name
Enter the name you want and save
Read the full article: Can I configure the Stages of the pipelines?
