It seems like the issue come from the child theme. I disabled child theme and the slider was shown on every pages. Now, once I re-activated child theme it’s ain’t working anymore
Updates: It works if you delete is_front_page() && from function sparkling_featured_slider() on the child theme’s functions.php file.
I hope you are well today and thank you for your question.
Please remove any changes you have made in the Sparkling theme and use the attached custom child theme of Sparkling theme that contains some custom code to achieve this.