I just tested with my free Subnautica from EGS
- In EGS setting, UNCHECK "Minimize To System Tray"
- Launch Subnautica
- ALT-TAB and close EGS (in my case, I have dual screen setup - Gaming screen on left, EGS client on right. I just move my mouse to the right and close EGS)
- Subnautica still running and playing it
I double checked with Task Manager and confirmed EGS client is NOT running
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I did another test...
-I tried directly run (double click) Subnautica.exe from File Explorer and it WILL NOT WORK. So I am guessing all EGS games NEED EGS client to "launch" the game, but once the game is launched, you can "close" EGS client.
“I am not a Mac user unless under duress.” - John Carmack