Navigate and click on Feed on the left side of your view. On the bottom right of your view, you will see and click on a blue button that reads as Open post settings.

Click on each specialized tile within the Post settings dashboard to select which post types will be enabled or disabled. Light blue means the post type has been enabled while, conversely, gray means the post type has been disabled.
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Once you have selected your post types and have confirmed your post settings, you are all set and free to navigate away from the Post settings dashboard!