Any way to sort these alpha? They used to be. Since update to CC2018, they are no longer. Don't see any way in the pop out menus.
You're looking at a bug from High Sierra and how it interacts with InDesign CC. It has been reported but has not yet been fixed between Apple and Adobe.
I thought I was going mad! I've only just upgraded to High Sierra as well and began to notice this as well.
If other readers are noticing the same issue, make sure to let Adobe know @ the wishform! Scripts Panel Sorting – Adobe InDesign Feedback
As I recall, it's not just in InDesign CC 2018, it's at least in CC 2017 as well so it really is a High Sierra issue.
Looks like it's a problem with all versions on High Sierra. I'm seeing it with CC2014 and CS6.
The Adobe engineers are aware of the problem but it may be Apple's to fix.
Just an note that the problem also appears in the Illustrator CC 2017 Scripts menu.
It's using "Date Added" information to sort. What I did here was open Scripts folder in Finder, moved everything to another folder, and start adding back one by one in the order I want them to appear. The first you add will be the first in list.
Hope it helps.