const Panel_left = document.getElementById('leftPanel');
const Panel_right = document.getElementById('rightPanel');

function hideLeftPanel() {
    if (Panel_right.style.display === 'none' || Panel_right.style.display === '') {
        Panel_left.style.display = 'none';
        Panel_right.style.display = 'flex';
      } 
    else {
        Panel_left.style.display = 'flex';
        Panel_right.style.display = 'none';
    }
}