5G Home Internet Gateway (UWB) Port 21 (FTP) is open! How to close it?

Hi - I used nmap to port scan my 5G gateway (UWB, the big one) from remote and found out that port 21 is open for connection. Does anyone know why this is opened? And do you have any idea how to close it? Note: port forwarding is off, DMZ is not enabled on Verizon gateway.

The firewall has very limited options (medium / high security) where the high-security setting breaks a bunch of connections with my home automation systems. There is no detailed description of what it means by medium or high security. It would be nice to allow advanced users to make fine-tune adjustments.

Thank you!

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