Hi!

You have to use the state to handle the collapse in the header. The code below should work :)

import React, { useState } from 'react';
import {
  MDBNavbar,
  MDBNavbarNav,
  MDBNavbarItem,
  MDBNavbarLink,
  MDBNavbarToggler,
  MDBContainer,
  MDBIcon,
  MDBCollapse,
  MDBBadge } from 'mdb-react-ui-kit';

export default function Header(Properties) {
  const [isCollapsed, setIsCollapsed] = useState(false);
  return (
    <MDBNavbar expand='lg' light bgColor='white'>
      <MDBContainer fluid>
        <MDBNavbarToggler onClick={() => setIsCollapsed(!isCollapsed)} aria-controls='Navbar' aria-expanded='false' aria-label='Toggle navigation'>
          <MDBIcon fas icon='bars' />
        </MDBNavbarToggler>
        <MDBCollapse navbar show={isCollapsed}>
          <MDBNavbarNav right className='mb-2 mb-lg-0'>
            <MDBNavbarItem active>
              <MDBNavbarLink aria-current='page' href='#'>
                Home
              </MDBNavbarLink>
            </MDBNavbarItem>
            <MDBNavbarItem>
              <MDBNavbarLink href='#'>Features</MDBNavbarLink>
            </MDBNavbarItem>
            <MDBNavbarItem>
              <MDBNavbarLink href='#'>Pricing</MDBNavbarLink>
            </MDBNavbarItem>
            <MDBNavbarItem>
              <MDBNavbarLink href='#'>About</MDBNavbarLink>
            </MDBNavbarItem>
          </MDBNavbarNav>
          </MDBCollapse>
                  {/* Right Align */}
        <div class="d-flex align-items-center">
          <a class="text-reset me-3" href="#">
            <MDBIcon fas icon="shopping-cart" />
          </a>

          <a
            class="text-reset me-3 dropdown-toggle hidden-arrow"
            href="#"
            id="navbarDropdownMenuLink"
            role="button"
            data-mdb-toggle="dropdown"
            aria-expanded="false"
          >
            <MDBIcon fas icon="bell" />
            <MDBBadge class="badge rounded-pill badge-notification bg-danger">1</MDBBadge>
          </a>
          <ul
            class="dropdown-menu dropdown-menu-end"
            aria-labelledby="navbarDropdownMenuLink"
          >
            <li>
              <a class="dropdown-item" href="#">Some news</a>
            </li>
            <li>
              <a class="dropdown-item" href="#">Another news</a>
            </li>
            <li>
              <a class="dropdown-item" href="#">Something else here</a>
            </li>
          </ul>

          <a
            class="dropdown-toggle d-flex align-items-center hidden-arrow"
            href="#"
            id="navbarDropdownMenuLink"
            role="button"
            data-mdb-toggle="dropdown"
            aria-expanded="false"
          >
            <img
              src="https://mdbootstrap.com/img/new/avatars/2.jpg"
              class="rounded-circle"
              height="25"
              alt=""
              loading="lazy"
            />
          </a>
          <ul
            class="dropdown-menu dropdown-menu-end"
            aria-labelledby="navbarDropdownMenuLink"
          >
            <li>
              <a class="dropdown-item" href="#">My profile</a>
            </li>
            <li>
              <a class="dropdown-item" href="#">Settings</a>
            </li>
            <li>
              <a class="dropdown-item" href="#">Logout</a>
            </li>
          </ul>
        </div>
        {/* Right Align */}
      </MDBContainer>
    </MDBNavbar>
  );
}

I see these examples need corrections, so thanks for reporting that :)

Keep coding!