Thanks, yes I see it in 2017. Well sort of - slice by surface, which is near enough.
I generally have had to remain with v17.2 pro, as I cannot live without an extensive set of VBA code/macros I've used for many years.
Any suggestions on which file format I should use if I want to switch between versions a few times on a particular drawing? Seems it has to be DWG of some sort as there's no TCW I can use to go 'backwards'.
Also 17.2 is about twice the speed, and icons etc appear a lot better than they do in 2017, I cannot work out why.....