"Open in Browser" not enabled/greyed out

I cannot get IntelliJ to show me the browser icons or let me navigate to open an HTML file in the browser.

I have looked at:

https://www.jetbrains.com/idea/webhelp10.5/previewing-pages-with-web-contents-in-a-browser.html

and

https://www.jetbrains.com/idea/webhelp10.5/web-browsers.html

but that has changed nothing. I am new to IntelliJ and expect I may just be missing something obvious,

Thanks