I found this https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3Da56BCuDwClU&ved=2ahUKEwjOy8Dv7IL8AhWKmGoFHalNBJUQFnoECAwQBA&usg=AOvVaw09F31bvCFa1-9bNjcvdLEO

Basically it says there is a clip to release so you can adjust the float.

It appears full, so if the water is running into the center overflow pipe, you need to adjust the float arm to trigger earlier. Most have a screw for adjustment but I can't see well enough from the picture to make further recommendation.