Yes I know it works, but considering its one of the most essential parts of BIAB its as flakey as hell. If you click anywhere outside the loop it reverts to playing the whole song, you cannot use the space bar to replay a loop too.
I suggest BIAB provides "pin" icons which you can click on at any bar, and these icons fix (properly) the playback, until one unclicks the pin icon. The loop function has been flakey for decades and needs a rewrite. It should not keep loosing its loop.

I agree with the suggestion of ZeroZero. Looping is an important feature which could and should be improved.