Loop a range

Been using ardour for live shows for months now but I still can’t make a simple loop so I can record on top.

I want to loop the range so I just right click on the range marker and click “loop range” but nothing happens. If I click “play range”, it plays the range. So why does “loop range” not loop the range. I’ve searched, read, but I must be missing something so basic.

ardour_loop_playing:

https://vimeo.com/240032582

AV linux 2017.4.9 // Ardour 5.11.4