Hello, friend!
The HG8145V5 is a carrier-series ONT.
I checked the screenshots you provided, and it is possible that the device is a customized version of the ISP. As we do not have access to customer-defined content and features, you will need to contact your local ISP for a solution.
The general version of the device is configured as described above, and log in to the WebUI of the device and view the 5G WLAN configuration.
Thanks!