In the announcements list you can see whether your announcements have been read.
Steps
1. In the platform, select Announcements from the menu.
2. On the announcement's row, look at the Views column.
What you will see
The Views column shows two indicators: Seen, with the number of members who opened the announcement, and Not seen, with the number who have not opened it yet.
You can also filter the list by team and by date range, using the filters above the list.