Joomla 4 Cassiopeia offcanvas menu

This alternative layout adds a default Bootstap 5 offcanvas menu to the Cassiopeia template.

1. download offcanvas.php and put the file in templates/cassiopeia/htm/mod_menu
2. Go to a menu module and add the module to the position "menu"
3. In the advanced tab select offcanvas in the Layout selector
4. Add a site title in the template options of Cassiopeia