Warframe PC Controller Button Mapping

[Kavzar_The_Blind]

I don't know where I should be posting this, so I ended up here (UI?). I took a 6 month hiatus from Warframe, and I come back, and my button mapping on my controller is an absolute mess from all the melee changes the game underwent while I was gone. I can't change the melee charge attack from my Left Trigger, and so every time I'm in the middle of a firefight, and I try to aim down the sights (ADS), I end up using my melee weapon's charge attack? Is there any possible means of getting button mapping, or switching to a different button layout for melee? This change has made the game unbearably clunky for me, and hoping for some kind of community solution to this. Thank you in advance for any help you can offer.