Accessibility is under Settings > General on all iDevices running iOS8-12 and perhaps older.
The Bold Text option appears in settings > display as well.
Does not really matter where it is, what's important is that selecting 'Bold Text' when there calls for and executes a 'hard re-set' on iOS12 and older, just like holding the home and power button together.
My question is if this 'Bold Text' method works w/ all iDevices that have no home button thinking that it might vary with different iOS versions.