Hi,

I think you can select the posts you want to display on the slider by use tag(s) or a featured categories.

You can create a new tag and add this tag for any posts you want to display on the slider. After that, go to Customize > Featured Slider Options > on "Filter Featured Slider By" > select "Tags" and on "Fill List Featured Tags for Featured Slider" fill the tag slug here.

Also, you can check to "Exclude All Posts In Featured Category/Featured Tags In Latest Posts on Homepage" to make the posts on the slider exclude on the latest posts on the homepage.

Note that: You need to update the theme to latest version ( version 5.2 ) to get this feature.  To update this theme, please check this guide:

https://pencidesign.ticksy.com/article/11593

Best Regards,

PenciDesign