Thank you, it works 
I've added this to my "Linux Commands / Setup" file 
A GUI option would still be desirable.
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The Traditional panel layout will not accept inputs from a touch screen for anything in the sub-menus of the top panel. No other panel layout seems to be affected. Touch screen is working correctly in all other area’s.
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When Cupertino is selected in mate-tweak and saved as a custom layout, then selected again after switching from another layout, Cupertino with brisk menu in the top panel is restored. Old layout perhaps? Edit: The brisk menu is only present after selecting the saved custom layout that was based on Cupertino.
18.04b1 patched to tonight has a rather odd German interpolation in the (UK English) Software & Updates:
I presume this is a Canonical error. Common sense would suggest that it should be removed quickly, but never assume common sense 
Can’t get gnome-boxes or vm to work…something missing?
Yes, one language/keyboard (United Kingdom).
Replying to myself, but now we know what this is; it had evidently been sneaked into a nightly without documentation. It is a mechanism for patching the kernel and making the patch “live” without rebooting, which requires a Ubuntu One account 
(And the German text is fixed … “Sign in …”).
I submitted a feature request bug for adding it to the Appearance settings' Interface tab: https://bugs.launchpad.net/ubuntu/+source/mate-control-center/+bug/1768165. When you get a chance, please click that it affects you so we get more developer interest.
Thank you. I’ve added myself as “being affected” 