una/modules/base/template/js/sidebar.js

document.addEventListener("DOMContentLoaded", function(event) {
    const isSidebarExpanded = toggleSidebarEl => {
        return toggleSidebarEl.getAttribute('aria-expanded') === 'true' ? true : false;
    }

    const toggleSidebar = (sidebarEl, expand, setExpanded = false) => {
        const bottomMenuEl = document.querySelector('[sidebar-bottom-menu]');
        const mainContentEl = document.getElementById('main-content');
        if (expand) {
            sidebarEl.classList.remove('bx-mc-narrowed');
            sidebarEl.classList.add('bx-mc-expanded');
            sidebarEl.classList.add('xl:w-64');
            sidebarEl.classList.remove('xl:w-16');
            mainContentEl.classList.add('xl:ml-64');
            mainContentEl.classList.remove('xl:ml-16');

            document.querySelectorAll('#' + sidebarEl.getAttribute('id') + ' [sidebar-toggle-item]').forEach(sidebarToggleEl => {
                sidebarToggleEl.classList.remove('xl:hidden');
                sidebarToggleEl.classList.remove('xl:absolute');
                sidebarToggleEl.classList.remove('bx-mpi-toggle-hidden');
            });

            // toggle multi level menu item initial and full text
            document.querySelectorAll('#' + sidebar.getAttribute('id') + ' ul > li > ul > li > a').forEach(e => {
                e.classList.add('pl-11');
                e.classList.remove('px-4');
                e.childNodes[0].classList.remove('hidden');
                e.childNodes[1].classList.add('hidden');
            });

            bottomMenuEl.classList.remove('flex-col', 'space-y-4', 'p-2');
            bottomMenuEl.classList.add('space-x-4', 'p-4');
            setExpanded ? toggleSidebarEl.setAttribute('aria-expanded', 'true') : null;
        } 
        else {
            sidebarEl.classList.add('bx-mc-narrowed');
            sidebarEl.classList.remove('bx-mc-expanded');
            sidebarEl.classList.remove('xl:w-64');
            sidebarEl.classList.add('xl:w-16');
            mainContentEl.classList.remove('xl:ml-64');
            mainContentEl.classList.add('xl:ml-16');
            document.querySelectorAll('#' + sidebarEl.getAttribute('id') + ' [sidebar-toggle-item]').forEach(sidebarToggleEl => {
                sidebarToggleEl.classList.add('xl:hidden');
                sidebarToggleEl.classList.add('xl:absolute');
                sidebarToggleEl.classList.add('bx-mpi-toggle-hidden');
            });

            // toggle multi level menu item initial and full text
            document.querySelectorAll('#' + sidebar.getAttribute('id') + ' ul > li > ul > li > a').forEach(e => {
                e.classList.remove('pl-11');
                e.classList.add('px-4');
                e.childNodes[0].classList.add('hidden');
                e.childNodes[1].classList.remove('hidden');
            });

            bottomMenuEl.classList.add('flex-col', 'space-y-4', 'p-2');
            bottomMenuEl.classList.remove('space-x-4', 'p-4');
            setExpanded ? toggleSidebarEl.setAttribute('aria-expanded', 'false') : null;
        }
    }

    const toggleSidebarMobile = (sidebar, sidebarBackdrop, toggleSidebarMobileHamburger, toggleSidebarMobileClose) => {
        sidebar.classList.remove('bx-mc-narrowed');
        sidebar.classList.add('bx-mc-expanded');
        sidebar.classList.toggle('hidden');
        sidebarBackdrop.classList.toggle('hidden');
        toggleSidebarMobileHamburger.classList.toggle('hidden');
        toggleSidebarMobileClose.classList.toggle('hidden');
    }

    const sidebar = document.getElementById('sidebar');
    const toggleSidebarEl = document.getElementById('toggleSidebar');
    if(sidebar) {
        document.querySelectorAll('#' + sidebar.getAttribute('id') + ' ul > li > ul > li > a').forEach(e => {
            var fullText = e.textContent;
            var firstLetter = fullText.substring(0, 1);

            var fullTextEl = document.createElement('span');
            var firstLetterEl = document.createElement('span');
            firstLetterEl.classList.add('hidden');
            fullTextEl.textContent = fullText;
            firstLetterEl.textContent = firstLetter;

            e.textContent = '';
            e.appendChild(fullTextEl);
            e.appendChild(firstLetterEl);
        });

        // initialize sidebar
        if (localStorage.getItem('sidebarExpanded') !== null) {
            if (localStorage.getItem('sidebarExpanded') === 'true') {
                toggleSidebar(sidebar, true, false);
            } else {
                toggleSidebar(sidebar, false, true);
            }
        }

        if(toggleSidebarEl) {
            toggleSidebarEl.addEventListener('click', () => {
                localStorage.setItem('sidebarExpanded', !isSidebarExpanded(toggleSidebarEl));
                toggleSidebar(sidebar, !isSidebarExpanded(toggleSidebarEl), true);
            });

            sidebar.addEventListener('mouseenter', () => {
                if (!isSidebarExpanded(toggleSidebarEl)) {
                    toggleSidebar(sidebar, true);
                }
            });

            sidebar.addEventListener('mouseleave', () => {
                if (!isSidebarExpanded(toggleSidebarEl)) {
                    toggleSidebar(sidebar, false);
                }
            });
        }    
    }

    const toggleSidebarMobileEl = document.getElementById('toggleSidebarMobile');
    if(toggleSidebarMobileEl) {
        const sidebarBackdrop = document.getElementById('sidebarBackdrop');
        const toggleSidebarMobileHamburger = document.getElementById('toggleSidebarMobileHamburger');
        const toggleSidebarMobileClose = document.getElementById('toggleSidebarMobileClose');

        toggleSidebarMobileEl.addEventListener('click', () => {
            toggleSidebarMobile(sidebar, sidebarBackdrop, toggleSidebarMobileHamburger, toggleSidebarMobileClose);
        });

        sidebarBackdrop.addEventListener('click', () => {
            toggleSidebarMobile(sidebar, sidebarBackdrop, toggleSidebarMobileHamburger, toggleSidebarMobileClose);
        });
    }
});