Sorry, but the video isn't showing me how this is done.
My take is that I just drag/select the nodes and that window opens. But it doesn't and I don't see how to get it to.
Andrew in times of uncertainty, you can always bring up the action list menu (ctrl+shift+p) and start typing. This can be a very quick way of doing many things in node red including group actions, disabling selected nodes, pretty much anything you can do from a menu or click action is in there + more.
Ah! Ok. Just that usually Ctl f brings up the browser's "search on this page". This would seem then that NR is intercepting the keys and using its own search.
Speaking of ctrl-f is there a way from the keyboard to get to the browser search? I find that in discourse forums, the first time does a forum search, but a second gives you the browser search. In node red, I haven’t been able to find a way to do it. Both types do search can be useful, but I wish I didn’t,have go to browser menu with mouse when I need browser search.