Toggle for hiding admin bar

It would be great to be able to include a feature to toggle on/off the admin bar while previewing a website, so you don't have to look at it in an incognito window.

Currently I'm using Hide WP Toolbar for this: https://wordpress.org/plugins/hide-wp-toolbar/

Works really well - but not compatible with uixpress. I could imagine it might be a great feature for uixpress however!