Hi,
I was agreeing with you.
They don't work in Compose.
In Earlier versions I had seen them go blue and presumed they would work.
It was only checking for this Thread I found that the Default of Off in High Sierra seemed to have overridden the settings that were on Sierra on the same computer before update.
My Mac User Account has been migrated from OS 9 and OS X 10.2 on my G4 through various OSes until Leopard (OS X 10.5) to an MacBook Pro 1,1 that I am not using at the moment that got to OS X 10.5.8 and then to the iMac running Sierra and then the new MacBook Pro running High Sierra now.
It is only at High Sierra I have noticed the change but even then this thread was the prompt to check.
I am finding that many settings that have worked for years across several computers now have to be checked in High Sierra.
8:44 pm Friday; October 27, 2017
iMac 2.5Ghz i5 2011 (Sierra)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
iPhone 6 iOS 11.x and an iPad (2)