Automatic Setting of Edge Beta as Default Browser

I just installed the Edge Beta and without asking it set itself as my default browser.  Bad behavior, it should ask before making that change.

I use different Browsers for different things.  I was totally ok being prompted which browser to use and would always uncheck the 'Set Default' check box.  Now I cannot find a way to get it back to no browser set as default.  When I look in Default App settings it will only allow me to choose a browser.