Open Settings > Connections > Messenger and Instagram to see the connection. Connecting and reconnecting are not available in the new-look page yet. Contact support for help.
The connection can support Messenger and Instagram messages, leads from ad forms and eligible results sent to Meta. Receiving messages and replying are separate capabilities and depend on your plan and access.
Disconnect for the whole connection disconnects the Facebook Page, and disconnecting a Page always disconnects its Instagram. Disconnect on the Instagram row disconnects Instagram only, and the Facebook Page keeps working: Instagram messages stop arriving and Instagram comment replies stop. In each dialog, This stops lists only the parts that are actually connected. If you do not see Disconnect, contact support for help. Campaigns already running at Meta can keep running and spending; check them in Meta. Your existing conversations and CRM leads are kept, and disconnecting in Engage does not stop WhatsApp.
Facebook may still list Engage among business integrations. Engage has not confirmed whether removing it there also stops your WhatsApp number in Engage. If you use WhatsApp in Engage, contact support before removing it from Facebook.
After the Facebook connection change, Facebook and Instagram cannot be connected or reconnected in the earlier look. Contact support for help while connecting is held. No recovery of missed messages or leads is promised.