You can export your script as a Final Draft (.fdx) file directly from the Script tab in Filmustage. This allows you to continue editing your script in Final Draft or other compatible screenwriting software while preserving structure and formatting.
Procedure
Go to app.filmustage.com, and open your project.
Navigate to the Script tab.
In the top-right corner, click the Export button.
From the dropdown menu, select FDX (Final Draft).
Follow the instructions in this article: How to export your script to a Final Draft (.fdx) file.