From your RDR2 quote, Was that the case with GTA V?
Anyhow I am not liking the rs games launcher, have to sign into games launcher and the sign in again when launching the game unless you click the save password auto launch option. Should only have to sign into the launcher. Plus I am having issues keeping my game LA Noire in fullscreen mode, there is no option to launch game in fullscreen so my game starts in a 8x10 minimized screen that I cant adjust to fit screen. So I have to go into settings click display change from my native option to something else and back to get it to switch to fullscreen. And if I drop down to pc to check something online and come back its back to minimized but with the window borders fitting my screen.
I am finding it quite annoying hope it isnt this way with RDR2.
Just press Alt+enter to go into full screen, yeah bugged the crap out of me as well.