If you’ve enabled WPBakery Slim Mode the Post Types Carousel element will not be available for use since you can use the newer and better Post Cards element instead. By using the Post Cards element you will have access to tons of preset card styles and the ability to create your own cards!
Post Types Carousel
The Post Types Carousel element can be used to display a carousel of posts from any post type. This is an older element that was added before the Post Cards, we recommend using the later.
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