how can I set a limit to the speed of the rigidbody2d in Unity ??

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I want the velocity parameter in ‘x’ not to exceed the maximum amount (Example (5, 0) maximum)

You can easily implement this functionality with a script.

public class RBSpeedLimit : MonoBehaviour
{
    private Rigidbody2D rb2D;

    public float maxHorizontalSpeed = 5;
    public float maxVerticalSpeed = 5;

    void Start() => rb2D = GetComponent<Rigidbody2D>();


    private void FixedUpdate()
    {
        var velocity = rb2D.velocity;
        
        //horizontal
        if (velocity.x > maxHorizontalSpeed) velocity.x = maxHorizontalSpeed;
        if (velocity.x < -maxHorizontalSpeed) velocity.x = -maxHorizontalSpeed;
        
        //vertical, if required
        if (velocity.y > maxVerticalSpeed) velocity.y  = maxVerticalSpeed;
        if (velocity.y < -maxVerticalSpeed) velocity.y = -maxVerticalSpeed;

        rb2D.velocity = velocity;
    }
}