After you publish an announcement, if you have many other announcements in your feed, and you want to ensure that a specific post is seen, you can pin it to the top.
When pinned any new post will always show below it.
📎NOTE: Only admin or announcements administrator users can follow these steps.
On the main menu click Announcements.
On the relevant post, click on the three dots.
Click Pin to the top.
The post now shows at the top. To un-pin it, follow the same steps as above and click Un-pin.