Option to enable launching the game in maximised window mode not displayed

I can’t seem to find the option to enable the game being launched in maximised window mode (not fullscreen mode, not any custom window size, just a normal, maximised window). I’m sure that, after 6 years of development, this absolutely fundamental feature of every windows program has finally been added to the launcher so we don't have to manually maximise the default mini-window every time we start the game. I just can't find the setting to enable it, it's not even hidden under advanced settings ... maybe somewhere else?

Either it’s me missing an obvious button or there is a bug or any other kind of issue causing it to not appear.