Start your calendar (as the installed CalDAV-Sync app provides a sync adapter, it integrates seamlessly with the native calendar app).

Select "Menu" -> "Calendar" to display all currently available calendars (the presentation on your device might be different from the image (Samsung Galaxy S3, S Planner)).

Now you can see all calendars which are currently available. Shared calendars on which you have access are shown too. Click on "Display" to manage, which calendars should really be showed (the presentation and text on your device might be different from the image (Samsung Galaxy S3, S Planner)).

Activate / deactivate the calendars according to your needs and click on "Done" to save these settings (the presentation and text on your device might be different from the image (Samsung Galaxy S3, S Planner)).