Currently, in Katalon Studio for MacOS, the Object Repository navigation lists its contents in a (seemingly) random order. The contents of these folders and subfolders should be alphabetical.
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This appears to be resolved in Katalon Studio 5.10.1! 
Hi Alex,
Thank you for the comment, i’ve tried on Mac and the sub-folder item are in order.
The Test Explorer items, however, were arranged for usage convenient not ABC order but i’ll put your suggestion in note.
Best,
Chris