For each Loop

  let accBox = document.querySelectorAll('.accBox');
   for (i = 0; i < accBox.length; i++) {
    accBox[i].addEventListener('click', function () {
                accBox.forEach(el => {
                    el.classList.remove('active');                           });
                this.classList.toggle('active');
            });
        }

  let accBox = document.querySelectorAll('.accBox');
   for (i = 0; i < accBox.length; i++) {
    accBox[i].addEventListener('click', function () {
                accBox.forEach(el => {
                    el.classList.remove('active');                           });
                this.classList.toggle('active');
            });
        }