Hello,
Yes, out of the box and depending on the selected layout, ( one, two, or three columns ), the sidebars should by default automatically hide on mobile devices, and revealed by a click on the arrows.
It may be an issue specific to your website. To isolate a possible problem on your website, I recommend following the troubbleshooting steps here after :
– enable WP_DEBUG mode and log the output of the debug.log to a file that you can share on http://pastebin.com/ or https://gist.github.com ( to get a debug log file you need to set define( ‘WP_DEBUG’, true ); and define( ‘WP_DEBUG_LOG’, true ); in your wp_config.php file.
– Walk through the basic troubleshooting steps like disabling all other plugins, clear cache and cookies and try again (Note that the Health Check plugin can do this without impacting any site visitors).

1. Use the latest software versions : make sure WordPress, your theme and plugins are all updated to their latest versions.
2. In your WordPress admin, go to settings > general and verify that your WordPress Address (URL) and Site Address (URL) are identical. The website will not run properly if the urls are different.
3. Cache plugin : if you use a server cache or cache plugin, clear it’s cache content and disable caching via it’s settings.
4. Browser :

• clear your browser’s cache / history,
• try to switch to another browser,
• make sure you do not use any add-ons or extensions in your browser that may conflict with your website.

• Check for plugin conflict : Install the WP official Health check plugin. Activate the troubleshooting mode. Then deactivate all of your plugins. If it fixes the issue, re-activate your plugins one by one, until you identify the plugin in conflict.
• Child theme : activate the parent theme if you use a child theme
• Theme problem : try to activate a WordPress default theme ( Twenty … )
• Javascript : make sure you did not insert custom javascript code ( like analytics, subscription popup… ), for example in a widget, that could break your site.

To log possible code errors on your website, enable WP_DEBUG mode and log the output of the debug.log to a file that you can share on http://pastebin.com/ or https://gist.github.com ( to get a debug log file you need to set define( 'WP_DEBUG', true ); and define( 'WP_DEBUG_LOG', true ); in your wp_config.php file.`