.navbar { display: none; }

Editing The Mobile Menu

The below instructions are available for installations with the "Mega Menu" Live Composer extension, which is used by default in the Cloudios Theme.

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.

On the "Mobile Navigation" feature select your menu which will be displayed on the mobile off-canvas panel.
On the "Style" tab you have multiple options for customization.