Transition Properties - On/ OFF switch

Is the intent to turn On /OFF transition in the inspector > transition > video to turn it on or off? There is no mention of it in the manual, ( page 727 ) and it doesn't work in 17.1 build 24
https://forum.blackmagicdesign.com/
https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=138702