Thanks for the reply.
I read the Ethos customizer article in the Knowledge Base and also checked the settings you suggested:
'Settings > Reading in the WordPress admin area and ensure that Your latest posts is selected for the Front page displays option. Once you have done that, you will also want to ensure that the Post Carousel, Post Slider, and Filterable Index are enabled in Customizer'
All these are enabled as you suggested.
No posts are displaying in my post carousel, and only 1 (the most recent) post is displaying in the post slider.
Please advise further on how to fix this issue.