Palette Play Loop Not Respected

Hi,

Consider this picture:

My expectation (based on the text) is that pressing (Space) or clicking the Play arrow will initiate sounding of a two-chord loop [ F(add4), F(add9) ].

What actually happens is the playback starts on the first chord (Am7).

Am I missing the proper way to select and play (only) a loop?   If so, please advise, and perhaps clarify the help text.   If not, this may be a bug.   Thanks!

(Synfire Express 2 v2.3.7)