Dear conectionist!
Please click the WLAN tab, and choose 2.4G Basic Network Settings from the navigation tree on the left. In the right pane. Check if there is data with the name "WirelessNet" in the SSID list, if so, please select it, and then uncheck it in the SSID activation setting box. Or just click "Delete". Then Click Apply.

If it cannot be changed, it means that the ISP has restricted the function of modifying the SSID. Please contact your ISP and apply for them to modify the settings for you remotely.
Thank you!