.navbar { display: none; }

Adding A Mobile Logo

Customize the Off-Canvas menu panel with your own logo

Go to WP Admin > Appearance > Headers/Footers and select the header you are using. In the case you are using the demo content, open in Live Composer the "Header - default design".
Mouse over the menu module until the module settings panel is displayed. Click on the cog icon. Use the "Mobile Menu Logo" option to add your mobile logo.