Serum loop points?

I am using Serum in FL Studio 20 on a MacBook. How do I stop a sample/note in Serum from playing after the pattern is finished? When I have this issue with other samples/notes playing long after the pattern I finished I think I fixed the issue by clicking cut self and disable loops points in the playback/settings. I don't see that option in Serum.

Env1 release time determines what happens when a note ends. I would suggest to use piano roll in FL and not the step sequencer buttons, so that there are note lengths you can adjust as desired.