You have to create a menu item link of type "List of events" to be able to display the event details view with the wanted page layout.
As it is set currently, the module don't find a menu item set to display event, so it uses the default page of your site.
Note: the menu item "iCagenda - List of events" can be in a hidden menu if you don't want to add link in your main menu.
Hope this helps?
Latest version : 3.7.18 (New install package, PHP8 & J3.10 ready)
We recommend every user to keep your iCagenda updated. Don't forget to have your Joomla!™ up-to-date!