The Joomla! CMS is mobile friendly but will not by default display your website's Main Menu in the drop-down cascading style suitable for phones and tablets (portrait view).
The Accordeon Menu CK Module published by Joomlack makes this possible. Recommended.
Accordeon Menu CK 2.2.0 is a bug fix release.
It adds the option to style the active menu link.
More about Accordeon Menu CK
You will find the release notes at the link below.
Tip: scroll down to the bottom of the page when you visit the link to see the release notes.
Contact our Customer Support if you would like help with installing the Module and configuring your website to work with it.
Back up before updating any 3rd party Joomla! extension
Any update can break your website.
Perform a FULL backup of your website (database and files) before installing any update.
WYNCHCO Joomla! CMS Support
We coach, help and support managers with responsibility for Joomla! websites in organisations across Cheshire, Manchester, Merseyside, North West England & the UK.