This feature is only available for business and creator accounts on Instagram.
With Instagram Direct, you can choose who can send your account a message or add your account to group conversations.
To change your Instagram Direct settings:
Go to your profile and tap
in the upper right corner.
- Tap Messages and story replies.
- Tap Message controls.
From here you can update:
- Which folder you'll receive new message requests, or whether to receive them at all.
- Who can add you to a group conversation
If someone who's not in your selected audience tries to message you or add you to a group conversation, they’ll see that you don’t allow messages from everyone.
Keep in mind,
if you block someone, they won't be able to send you a message request or add you to a group conversation.