How to Enter and Exit Big Picture Mode on Steam in Windows?
Disable Big Picture being forced in-game. Steam>Settings>In-Game> Uncheck "Use the Big Picture Overlay when using a steam input..." : r/MonsterHunterWorld
Getting Started for Players (Steamworks Documentation)
How to Stop Steam From Opening on Startup
Steam Acting Slow and Laggy on M1 Mac? - Disable GPU Acceleration and Smooth Scrolling to Get Smooth Scrolling and Snappier Interface in Steam. : r/macgaming
Remove a controller from Steam and/or disable Steam controller configuration entirely : r/Steam