I know what you mean (spent far too long Excel messing in my work life) but no dice, nothing happens. I also cannot revert to the ribbon UI, there is no way to do it. I've uninstalled it (3 times) cleared out any references to it, restarted the PC, and still it reinstalls in the classic UI with no option to change. I am really, really, hacked off with it now! I only "upgraded" because it claimed TC2018 had better handling of pick point hatched in enclosed areas, and I have a complex drawing to struggle with that TC 2016 started working OK with, then stopped doing the hatches. I'll be asking for a refund if they don;t sort it in the next couple of days. Fancy introducing software as broken as this? Who do they think they are, Microsoft?