melonDS Steam Deck Left trackpad is a radial wheel where you can load or save states. Right trackpad can be used as a mouse to control the touchscreen or navigate emulator menus. Left stick acts like a d-pad so you can control with either it or the d-pad. R2/L2 function identically to R1/L1. Use whatever is more comfortable! Back triggers enable rewind, toggle fullscreen, or swap screens. Look at the layout to see where they are mapped. Mouse Inputs Keyboard Inputs Gamepad Inputs Radial Menus
