Post meta data are the general information about the post you provide to the readers. Post date, post comments, post author and post views are the information which come under the category of post meta.
1. Show/Hide Featured Image
This setting will hide/show the featured image in homepage/index area of your blog. It will work only for those posts which have images added in their featured post section. Read this for (more info)
2. Show/Hide Post Category
This setting will hide the post category above the post title.
3. Show/Hide Post Meta
This setting will hide the post date which is just below the post title.
Note: This help guide is specifically for Milannio WordPress Theme