During the use of Syncthing, suddenly found that the Syncthing service is not found in the service list, unable to stop the Syncthing from running, and setting the user and password in the GUI interface is also ineffective, unable to achieve encrypted login.
First of all, how did you install Syncthing? There is an installer package “SyncthingWindowsSetup”, but also plenty of other possible ways to install it.
What actions did you take that lead you to believe it should be listed in the Windows services list? Have you read and used Starting Syncthing Automatically — Syncthing documentation?
As for the GUI authentication, please tell us what you did and what you expected to see and what it looked like instead. As it stands, there is almost no information in your request to help us help you.