@Bud, this feature allows you to pin that post to the top of the Questions Board the post is located in, but just for you. Because the ArcGIS Pro Videos Board is built on the Question Board type, you and other members have that option. It's a feature that doesn't appear in all Board types. Hope this helps explain, but if it's not clear do let me know.
Jesse Cloutier
Community Manager, Engagement & Content
