Connected devices/browsers will be listed here. If you are not seeing your device in the list, it's probably because the Browsersync script tag is not being loaded on your page.
Browsersync works by injecting an asynchronous script tag (<script async>...</script>) right after the <body> tag during initial request. In order for this to work properly the <body> tag must be present. Alternatively you can provide a custom rule for the snippet using snippetOptions