Thanks for reaching out about this in the Community!
The option to minimize the app to System Tray is not available for quite some time now.
Instead you have the two options that can be seen in your screenshots. For the first one select Minimized - this will make the app start with windows, but it will be minimized to the Task Bar. If you enable the second option as well, once you hit the X button, the app will be hidden in the system tray, but remain open.
Hope this clears things up. Don't hesitate to reach out again if you have questions.
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