Hi [@Rogelio Sanchez](/profile/?id=56376),

To toggle the slim menu you need to use this function:

  sidenavToggle = sidenavId => () => {
    const sidenavNr = `sideNav${sidenavId}`;
    this.setState({
      [sidenavNr]: !this.state[sidenavNr]
    });
  };

Your slimSideNav is open by default because of the default state. You need to manage the opening sidenavs by state.

I prepare for you a little snippet that works well.

import React, { Component } from 'react';
import { BrowserRouter as Router } from 'react-router-dom';
import {
  MDBSideNavCat,
  MDBSideNavNav,
  MDBSideNav,
  MDBSideNavLink,
  MDBContainer,
  MDBIcon,
  MDBBtn
} from 'mdbreact';

class SideNavPage extends Component {
  state = {
    sideNavLeft: false
  };

  sidenavToggle = sidenavId => () => {
    const sidenavNr = `sideNav${sidenavId}`;
    this.setState({
      [sidenavNr]: !this.state[sidenavNr]
    });
  };

  render() {
    return (
      <Router>
        <MDBContainer>
          <MDBBtn onClick={this.sidenavToggle('Left')}>
            <MDBIcon size='lg' icon='bars' />
          </MDBBtn>
          <MDBSideNav
            slim
            mask='rgba-blue-strong'
            triggerOpening={this.state.sideNavLeft}
            breakWidth={1300}
            className='sn-bg-1'
          >
            <li>
              <div className='logo-wrapper sn-ad-avatar-wrapper'>
                <a href='#!'>
                  <img
                    alt=''
                    src='https://mdbootstrap.com/img/Photos/Avatars/img%20(10).jpg'
                    className='rounded-circle'
                  />
                  <span>Anna Deynah</span>
                </a>
              </div>
            </li>

            <MDBSideNavNav>
              <MDBSideNavLink to='/other-page' topLevel>
                <MDBIcon icon='pencil-alt' className='mr-2' />
                Submit listing
              </MDBSideNavLink>
              <MDBSideNavCat
                name='Submit blog'
                id='submit-blog'
                icon='chevron-right'
              >
                <MDBSideNavLink>Submit listing</MDBSideNavLink>
                <MDBSideNavLink>Registration form</MDBSideNavLink>
              </MDBSideNavCat>
              <MDBSideNavCat
                name='Instruction'
                id='instruction'
                icon='hand-pointer'
                href='#'
              >
                <MDBSideNavLink>For bloggers</MDBSideNavLink>
                <MDBSideNavLink>For authors</MDBSideNavLink>
              </MDBSideNavCat>
              <MDBSideNavCat name='About' id='about' icon='eye'>
                <MDBSideNavLink>Instruction</MDBSideNavLink>
                <MDBSideNavLink>Monthly meetings</MDBSideNavLink>
              </MDBSideNavCat>
              <MDBSideNavCat name='Contact me' id='contact-me' icon='envelope'>
                <MDBSideNavLink>FAQ</MDBSideNavLink>
                <MDBSideNavLink>Write a message</MDBSideNavLink>
              </MDBSideNavCat>
            </MDBSideNavNav>
          </MDBSideNav>
        </MDBContainer>
      </Router>
    );
  }
}

export default SideNavPage;

Best regards,

Kuba