With this resolution you cant close your friend list
another bug is that the game goes to 1920x1080 automatically at the start
I am also on 3440 x 1440 and I can confirm both of these issues. My resolution doesn't reset to 1920x1080 though, it resets to 1920x1440. I have to change the resolution back to 3440x1440 every single time I launch the client. Super Annoying. All other graphics options persist between sessions.