[Windows Central Question]

Like in windows when you click with right button in the connection want to know, and set properties and than select "show password" box.

[Harrie-S]

On the phone that's not possible but if you sync all wifi settings with your ms account the wifi network name will also show up in your laptop and then you could get the password with a tool in windows like in below link.
http://www.nirsoft.net/utils/wireless_key.html