Server Version#: 1.18.5.2309 (Synology NAS)
Player Version#: Tizen latest (it auto-updates)
I found the setting for Autoplay and disabled it because I personally find this feature annoying. I tend to fall asleep when watching things later in the day and I’ll miss entire episodes of TV shows. With this setting off, the next TV episode no longer automatically plays when the previous concludes. 
However, I’ve discovered that this feature flag is ignored when watching a collection in a Movies library.
Steps to reproduce:
- Go to Settings and turn off Autoplay
- Open a library with type Movies
- Navigate to Collections tab
- Watch a movie to completion
- The next movie in the collection will auto-play
Again, this feature flag works as expected for libraries with type TV shows. I have not tested with the Other Videos library type (I don’t have any library configured with this on my server).