Set via FORWARD_URL / FORWARD_MAX_AGE_SECONDS env vars.
Applies to every device that hasn't set its own value.
Only messages from active groups are forwarded. The list auto-reloads every 10 minutes.
When on, WhatsApp Web stops rendering to keep the app light — background message reading keeps working. It only takes effect after the device is logged in. Turn it off and Reload the device to get the full UI back.
On your phone: WhatsApp → Settings → Linked devices → Link a device, then scan this code.
On your phone: WhatsApp → Settings → Linked devices → Link a device → Link with phone number instead, then enter this code.