If you want to stop your door closer from closing automatically, there are a few things you can try:
Adjust the door closer settings: Most door closers allow you to adjust the speed and force with which they close. If you want to slow down the closing speed or reduce the force of the closing, you can follow the steps in the door closer's manual. This usually involves adjusting the hydraulic control valves on both sides of the door.
Disconnect the power: If it is an electric door closer, you can prevent it from working by disconnecting the power supply or unplugging it.
Mechanical lock: Some door closers can be fixed in the open position with a mechanical locking device to prevent them from closing automatically.
Remove or disable the door closer: If none of the above methods work, the last resort is to remove the door closer from the door or disable it. This may involve some skills and tools, or may require the help of a professional.
Before making any adjustments or removing the door closer, make sure to read and understand the manufacturer's instructions, or seek the help of a professional to avoid damage to the door or door closer.