Yes! The option to save a segment will appear after you add at least one User Filter or Event Filter.
Click the Save Segment button at the top of the page. Name your segment, give it a description, and add it to a Space. Then, click Save segment.
Where you can find your saved segments
Find your Segments in the Space where you saved them, or go to the Library and click Segments to see all Segments in your account.
Note: Each user can curate their own list of favorite segments by clicking the ⭐️ icon located next to the name of the segment. When you star a segment, FullStory adds it to your Starred Items for easy access.