To stop students from posting replies to individual announcements, you can close an announcement to comments.
Notes:
- If your announcements display a lock icon, announcement comments have already been closed to comments. Based on your institution's preference, comments may be disabled by default.
- You may be able to open individual announcements for comments that have been closed. However, if the option to open a comment is not available, your institution has restricted this feature.
Open Announcements

In Course Navigation, click the Announcements link.
Close for Comments

Locate the announcement and click the Settings icon [1]. Click the Close for comments link [2].
View Announcement

When your students view the announcement, the announcement shows it is closed to comments.
Open to Comments

if you need to open the announcement, locate the announcement and click the Settings icon [1]. Click the Open to Comments link [2].
Note: If the Open to Comments link is not available, your institution has restricted this option.
View Announcement

View the unlocked announcement.
Comments
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