Just tried it out.I guess I didn't explain this very well haha. Someone reported to me that their retroarch was force closing itself whenever they pressed that combo accidentally (Push both analog sticks in and L+R). I tried it out on my system, where I have never setup hotkeys, and yeah I get the same thing. I'm just wondering if this is a bug i should report or not
Indeed, pushing both Analog sticks down along with L+R quits RetroArch entirely back to the HBL.
However, I don't think this is an issue, but more like a Button combo hotkey to exit RetroArch instantly, no need to worry about that.