I notice that if my WiFi is turned off in Windows, and I go to the WiFi App's Settings > Connections > 'Enable Trusted WiFi Networks Management', that it closes the program down without any warning when I click the '+' Sign to add a trusted SSID. It obviously causes an error because the WiFi is disabled and it's not able to list the available SSID's. When I enable my WiFi again, it then works as expected after restarting the WiFi app. It probably needs some sort of feedback control that notifies you to turn on WiFi and then try again?
O/S: Windows 10 Enterprise (1803)
PS. I realise this is a consumer product and I have it installed on a business Laptop which I use for both purposes, but I think the nature of this issue would probably affect other users as well.