Check your mod’s documentation — often they’ll say “press X + Y on controller” for mod activation.
Are you trying to to ride a dolphin in Minecraft? dolphin mod button
When held, the analog stick’s range is capped at 50%. This allows players using a keyboard or digital controller to perform delicate actions like "walking" or "up-tilting" without jumping, mimicking the slight tilt of an actual GameCube analog stick. Check your mod’s documentation — often they’ll say