From Teltonika Networks Wiki
The image Networking_rutx_manual_firewall_general_settings_zones_v1.png is not showing up in the Zones section, instead it shows as markup:
Zones The Zones section is used to manage default traffic forwarding policies between different device zones. The figure below is an example of the Zones section and the table below provides information on the fields contained in that section: [[File::Networking_rutx_manual_firewall_general_settings_zones_v1.png]]
PS You can remove this comment after this issue if fixed.